Corrosion-resistant pump composite structure shaft sleeve device

Abstract

The application discloses a composite structure shaft sleeve device for corrosion-resistant pumps, which comprises a shaft sleeve shell, and a plurality of limiting grooves are distributed on the inner wall of the shaft sleeve shell in the circumferential direction; a plurality of independent floating wear-resistant bushings are arranged in the shaft sleeve shell; a limiting protrusion matched with the limiting grooves is arranged on the back surface of the floating wear-resistant bushing, and the limiting protrusion is clamped in the corresponding limiting groove; an elastic supporting unit is arranged between the bottom of the limiting groove and the back surface of the floating wear-resistant bushing; the floating wear-resistant bushing is supported by the elastic supporting unit and can float radially in the shaft sleeve shell. Through the self-adaptive adjustment of the floating wear-resistant bushing, the shaft deflection of the pump can be effectively compensated, and uniform wear can be realized; the labyrinth gap and the lubricating structure can block the corrosive medium and realize long-acting lubrication; meanwhile, the modular design facilitates maintenance and replacement, so that the service life and reliability of the shaft sleeve under harsh working conditions are remarkably improved.

Description

Technical Field

[0001] This invention belongs to the field of pump shaft sleeve technology, specifically a composite structure shaft sleeve device for corrosion-resistant pumps. Background Technology

[0002] In pump equipment, the bushing is a critical component installed on the pump shaft between the impeller and the pump body. Its main function is to protect the pump shaft, withstand the relative rotational friction between the impeller and the bushing, and prevent direct wear of the pump shaft. In applications involving the conveying of highly corrosive media such as acids, alkalis, and salt solutions, the bushing not only needs excellent wear resistance to withstand mechanical wear but also extremely strong corrosion resistance to resist media erosion. Traditional bushings are often made of a single material, making it difficult to simultaneously meet the dual requirements of high wear resistance and high corrosion resistance, resulting in a short service life and frequent replacements.

[0003] A search revealed that Chinese utility model patent CN217582561U discloses a high-strength, corrosion-resistant water pump shaft sleeve. This patented technical solution includes a shaft sleeve body with a limiting ring at one end of its inner cavity. A detachable arc-shaped wear-resistant plate, made of tungsten carbide alloy, is mounted on the wear sleeve via a sliding groove and a limiting clip, and is axially pressed and fixed by a threaded ring and a first screw. Furthermore, the shaft sleeve body also includes a pressing plate driven by a second screw, used to radially press the wear-resistant plate from the outside, ensuring a tight fit with the pump shaft.

[0004] The aforementioned existing technology, by incorporating individually replaceable wear-resistant plates, solves the problem of high costs associated with replacing the entire bushing after wear, demonstrating a certain degree of progress. However, in more complex and demanding industrial application environments, this solution still has the following limitations: 1. Lack of adaptive compensation capability: Its wear-resistant plate is rigidly clamped and fixed by a screw-driven extrusion plate, and has a static interference or clearance fit with the pump shaft. When the pump shaft experiences slight runout or radial runout due to temperature rise, vibration, or installation errors during operation, this rigid connection cannot adaptively adjust. This easily leads to uneven local contact stress between the wear-resistant plate and the pump shaft, exacerbating uneven wear, affecting the smoothness of shaft operation, and potentially generating abnormal vibration and noise.

[0005] 2. Insufficient resistance to media penetration and long-term lubrication: This design mainly relies on end sealing rings and gaskets for axial sealing, lacking an effective barrier against radial penetration of corrosive media into the bushing along the joints of the wear-resistant plates. Furthermore, its lubrication structure is unclear, making it difficult to form and maintain a stable lubricating film under the influence of highly corrosive media, thus accelerating the wear of the friction pair.

[0006] 3. There is still room for improvement in ease of maintenance: When replacing the wear plate, multiple parts such as the first screw, threaded ring, second screw and extrusion plate need to be disassembled in sequence, which is a rather cumbersome operation.

[0007] Therefore, there is an urgent need for a new type of composite structure bushing device to solve the above-mentioned technical problems and adapt to more stringent industrial application requirements. Summary of the Invention

[0008] To address the problems mentioned in the background section, the present invention adopts the following technical solution.

[0009] A composite structure shaft sleeve device for corrosion-resistant pumps includes a shaft sleeve housing with multiple limiting grooves distributed circumferentially on the inner wall of the housing. Multiple independent floating wear-resistant lining blocks are provided inside the housing. Each floating wear-resistant lining block has a limiting protrusion on its back that matches the limiting groove, and the limiting protrusion engages with the corresponding limiting groove. An elastic support unit is provided between the bottom of the limiting groove and the back of the floating wear-resistant lining block. The floating wear-resistant lining block is supported by the elastic support unit and can float radially within the housing.

[0010] Compared with the prior art, the beneficial effects of the present invention are as follows: 1. Adaptive load distribution, extended service life and smooth operation: Each floating wear-resistant liner is supported by an independent elastic unit, allowing for slight radial floating. When the pump shaft vibrates or wobbles, the liner automatically adjusts its position, maintaining a uniform fit with the pump shaft, avoiding localized stress concentration and uneven wear. This results in more even wear, significantly extending the overall service life of the bushing and pump shaft, while also ensuring smoother equipment operation and lower noise.

[0011] 2. Effectively blocks corrosive media and provides long-lasting lubrication: The specially designed labyrinthine gaps between adjacent liner blocks greatly increase the resistance to corrosive liquids or gases penetrating inwards along the gaps, protecting the internal pump shaft and elastic unit. Simultaneously, this labyrinthine channel, combined with the oil injection channels on the housing and the micropores on the liner blocks, continuously and evenly guides lubricating oil or grease to the friction surfaces, forming a stable lubricating film and reducing the wear rate.

[0012] 3. Convenient maintenance and good economy: The wear-resistant bushing is an independent module that simply snaps into the groove of the bushing housing via a protrusion on the back. When a bushing wears down to the point of needing replacement, it can be removed and replaced individually without replacing the entire bushing housing. This greatly reduces subsequent maintenance costs and spare parts inventory costs, and also shortens downtime for maintenance.

[0013] 4. Reliable structure and guaranteed performance: The bushing housing is made of high-strength, corrosion-resistant plastics such as reinforced polyetheretherketone (PEEK) to resist the erosion of external media; while the floating bushing is made of ultra-hard, wear-resistant materials such as silicon carbide ceramics to withstand mechanical friction. This division of labor between "externally corrosion-resistant and internally wear-resistant" composite materials, combined with the modular floating structure, ensures the reliability and durability of the bushing under harsh working conditions. Attached Figure Description

[0014] Figure 1 This is a three-dimensional structural diagram of the corrosion-resistant pump in this invention.

[0015] Figure 2 This is a partial cross-sectional view of the corrosion-resistant pump in this invention.

[0016] Figure 3 This is a three-dimensional structural diagram of the bushing in this invention.

[0017] Figure 4 This is a partial sectional view of the bushing in this invention.

[0018] Figure 5 This is a diagram of the internal structure of the bushing in this invention.

[0019] In the figure, 1. Bushing housing; 2. Limiting groove; 3. Floating wear-resistant liner; 4. Limiting protrusion; 5. Elastic support unit; 6. Labyrinth clearance; 7. Oil injection channel; 8. Capillary groove; 9. Disc spring; 10. Solid lubricating coating; 11. Annular gland. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0021] It should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention.

[0022] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0023] like Figures 1-5As shown, a composite structure bushing device for corrosion-resistant pumps according to the present invention includes a bushing housing 1. Multiple limiting grooves 2 are distributed circumferentially on the inner wall of the bushing housing 1. Multiple independent floating wear-resistant lining blocks 3 are provided inside the bushing housing 1. The back of each floating wear-resistant lining block 3 is provided with a limiting protrusion 4 that matches the limiting groove 2, and the limiting protrusion 4 engages with the corresponding limiting groove 2. An elastic support unit 5 is provided between the bottom of the limiting groove 2 and the back of the floating wear-resistant lining block 3. The floating wear-resistant lining block 3 is supported by the elastic support unit 5 and can float radially within the bushing housing 1.

[0024] In this structure, when the corrosion-resistant pump starts and runs, the pump shaft drives the mating floating wear-resistant liner 3 to rotate together. The floating wear-resistant liner 3 is engaged in the limiting groove 2 of the bushing housing 1 by the limiting protrusion 4 on its back. Because the elastic support unit 5 between the bottom of the limiting groove 2 and the back of the floating wear-resistant liner 3 provides continuous radial support force for each floating wear-resistant liner 3, the bushing housing 1 and the floating wear-resistant liner 3 are relatively fixed in the circumferential and axial directions and can transmit torque synchronously, but they form a floating fit in the radial direction. This design makes the floating wear-resistant liner 3 not rigidly fixed, but a dynamic adaptive module. During operation, if the pump shaft produces a small radial runout or eccentricity due to load changes, manufacturing and assembly tolerances, or media disturbances, the radial preload provided by the elastic support unit 5, together with the fluid damping effect formed by the labyrinth gap, works together to achieve adaptive sealing and stable support of the bushing under dynamic sway conditions.

[0025] This floating mechanism achieves two core beneficial effects: first, adaptive compensation, meaning that each floating wear-resistant liner 3 can independently adjust its position, allowing the inner working surface of the entire liner set to better track the actual rotation center of the pump shaft, maintaining a uniform fit clearance and avoiding localized hard collisions or unilateral wear; second, vibration damping, where the elastic support unit 5 can absorb and buffer some of the radial vibration from the shaft system, helping to improve the smoothness of the entire pump unit's operation and reduce noise. Therefore, this structure effectively improves the adaptability and service life of the bushing under complex working conditions.

[0026] In one embodiment, a non-linear labyrinthine gap 6 is formed between adjacent floating wear-resistant liner blocks 3, and the flow channel cross-section of the labyrinthine gap 6 is "Z" shaped or stepped.

[0027] In this structure, the adjacent floating wear-resistant liner blocks 3 are not tightly fitted together, but are intentionally designed and maintained with a non-linear labyrinthine gap 6. The flow channel cross-section of the labyrinthine gap 6 is constructed into a complex shape such as a "Z" shape or a stepped shape.

[0028] The core function of this design is to achieve functional barrier and flow guidance. First, the tortuous path significantly increases the resistance to corrosive media penetrating along the axial direction of the bushing. As the media flows through the tortuous channels, its kinetic energy is continuously dissipated, effectively slowing down or preventing its intrusion into deeper areas inside the bushing, protecting the internal elastic support unit 5 and the pump shaft. This non-rigid connection design also provides the necessary structural space for the independent radial floating of each floating wear-resistant liner 3, ensuring its adaptive adjustment function is unrestricted.

[0029] In one embodiment, the bushing housing 1 has at least one oil injection channel 7 that communicates with the bottom area of ​​the limiting groove 2, and the floating wear-resistant liner 3 has micropores or capillary grooves 8 on its side or back to guide the lubricating medium from the oil injection channel 7 to the working surface of the floating wear-resistant liner 3.

[0030] In this structure, the oil injection channel 7 on the bushing housing 1 is directly connected to the bottom area of ​​the limiting groove 2, creating a clearly directional lubricating medium delivery path. The lubricating medium can be directly injected into the bottom of the limiting groove 2 through the oil injection channel 7. The micropores or capillary grooves 8 on the side or back of the floating wear-resistant liner 3 constitute a highly efficient micro-guided network. These micropores or capillary grooves 8 can actively, continuously, slowly, and uniformly adsorb and guide the lubricating medium accumulated at the bottom of the limiting groove 2 to the working surface of the floating wear-resistant liner 3 that contacts the pump shaft.

[0031] The core advantage of this design lies in achieving precise and long-lasting lubrication. It ensures that the lubricating medium can bypass obstacles, directly penetrate and cover the critical friction pair interface, forming and maintaining a stable lubricating film on the working surface. This effectively reduces the coefficient of friction and wear rate between the floating wear-resistant liner 3 and the pump shaft. Simultaneously, the lubricating medium also provides some protection for the elastic support unit 5. The entire lubrication process is achieved through the structure itself, eliminating the need for complex additional power devices, thus improving system reliability and ease of maintenance.

[0032] In one embodiment, the elastic support unit 5 is a disc spring 9, a wave spring, or a columnar elastic rubber body.

[0033] In this structure, the elastic support unit 5, as the core component for the radial adaptive function of the floating wear-resistant liner 3, provides flexibility for the device to cope with different working conditions through its specific form selection. When using a disc spring 9, its advantage lies in providing greater support force and stable stiffness within a limited installation space, ensuring that the floating wear-resistant liner 3 has a clear reset tendency and load-bearing capacity. Using a wave spring focuses more on achieving uniform elastic force and a longer fatigue life within a compact structure. When using a columnar elastic rubber body, it not only provides the necessary elastic support but also possesses excellent damping and vibration reduction characteristics, more effectively absorbing and dissipating high-frequency micro-amplitude vibrations from the pump shaft.

[0034] Regardless of the specific form adopted, the common function of the elastic support unit 5 is to enable the floating wear-resistant liner 3 to overcome friction and make "suspended" micro-movements when bearing the radial load of the pump shaft, thereby achieving load equalization and compensation for sway.

[0035] In one embodiment, the floating wear-resistant liner 3 is made of silicon carbide ceramic or silicon nitride ceramic, and the working surface of the floating wear-resistant liner 3 is coated with a solid lubricating coating 10, the coating thickness of which is controlled to be 10-30μm.

[0036] In this structure, the floating wear-resistant liner 3 is made of silicon carbide ceramic or silicon nitride ceramic as the matrix material. It has extremely high hardness, excellent wear resistance and good chemical inertness, which can resist mechanical wear and chemical corrosion of the medium between the pump shaft and the pump shaft.

[0037] Applying a solid lubricating coating 10 to the working surface of this ultra-hard wear-resistant substrate is a key design feature that further enhances its tribological properties. The thickness of this coating 10 is precisely controlled within the range of 10-30 μm, sufficient to form a complete, continuous lubricating film with adequate load-bearing capacity on the working surface. During the operation of the bushing, this solid lubricating coating 10, acting as a direct friction interface, significantly reduces the coefficient of sliding friction between the floating wear-resistant liner 3 and the pump shaft, resulting in smoother operation.

[0038] In one embodiment, the bushing housing 1 has annular pressure caps 11 at both axial ends, and there is an axial movement gap of 0.2-0.5mm between the inner edge of the annular pressure caps 11 and the end face of the floating wear-resistant liner 3.

[0039] In this structure, the annular caps 11 provided at both axial ends of the bushing housing 1 mainly serve to axially constrain and enclose all the internal floating wear-resistant bushings 3. The key design is that the inner edge of the annular cap 11 and the end face of the floating wear-resistant bushing 3 are not tightly fitted, but rather a 0.2-0.5mm axial clearance is intentionally maintained.

[0040] This tiny but precise gap design serves multiple practical purposes. First, it allows for minimal axial free space in the floating wear-resistant liner 3, preventing the annular gland 11 from rigidly clamping the liner 3 axially due to manufacturing or assembly errors, thus ensuring that the radial floating freedom of the liner 3 remains unaffected. Second, this gap provides necessary compensation space for thermal expansion that may occur during system operation, preventing unnecessary assembly stress caused by internal components squeezing each other due to material thermal expansion. Simultaneously, the annular gland 11 itself, as a removable end cap, facilitates the assembly of the entire bushing assembly and subsequent maintenance and inspection of the floating wear-resistant liner 3.

[0041] In one embodiment, the floating wear-resistant liner 3 adopts at least two different sizes and shapes in the circumferential direction, so that the inner hole after assembly forms a standard circle.

[0042] In this structure, the floating wear-resistant liner 3 does not use a single specification that is exactly the same in the circumferential direction. Instead, it is specially designed to be assembled from at least two different sizes and shapes. This design is mainly to solve the problem of "cumulative tolerance" in precision assembly and to optimize the stress distribution.

[0043] When all floating wear-resistant liners 3 are exactly the same in size and shape, minute manufacturing tolerances accumulate circumferentially, potentially causing the assembled inner hole to appear as an irregular polygon rather than an ideal standard circle. By using combinations of different specifications, the dimensional differences can be compensated and adjusted for each other, like a precise jigsaw puzzle, so that the working surfaces of all floating wear-resistant liners 3 can ultimately form an inner hole that is close to a geometrically standard circle. This not only ensures a uniform and ideal fit clearance with the pump shaft, but also ensures that each floating wear-resistant liner 3 can effectively contact and bear the load with the pump shaft, thereby achieving truly uniform force distribution. At the same time, the consistent circular inner hole profile is also the basis for all floating wear-resistant liners 3 to achieve coordinated and consistent radial floating motion, avoiding situations where some liners get stuck or fail to float due to non-circular inner holes.

[0044] In one embodiment, the bushing housing 1 is made of reinforced polyetheretherketone or filled polytetrafluoroethylene.

[0045] In this structure, the bushing housing 1 is made of reinforced polyetheretherketone or filled polytetrafluoroethylene, which is the result of comprehensively considering its material properties under harsh working conditions and the overall functional requirements of the device.

[0046] Reinforced polyetheretherketone (PEEK), a high-performance specialty engineering plastic, possesses excellent mechanical strength, fatigue resistance, high-temperature resistance, and superior chemical corrosion and hydrolysis resistance, providing a robust and dimensionally stable structural framework for the entire bushing assembly. Filled polytetrafluoroethylene (PTFE), on the other hand, is modified from pure PTFE by adding fillers such as glass fiber, carbon fiber, or graphite. While retaining excellent corrosion resistance, low coefficient of friction, and self-lubricating properties, it significantly improves the material's stiffness, creep resistance, and wear resistance.

[0047] In one embodiment, the limiting groove 2 is a T-shaped groove, and the corresponding limiting protrusion 4 is a T-shaped protrusion, which cooperates with the T-shaped groove.

[0048] In this structure, the limiting groove 2 is specifically designed as a T-shaped groove, and the limiting protrusion 4 on the back of the floating wear-resistant liner 3 is correspondingly designed as a T-shaped protrusion, forming a precise and reliable mechanical fit.

[0049] The combination of the T-shaped protrusion and the T-shaped groove enables precise constraint and guidance of the floating wear-resistant liner 3 in multiple degrees of freedom. First, the T-shaped structure provides strong shear resistance. After the T-shaped protrusion is embedded in the T-shaped groove, it can effectively transmit circumferential torque, preventing the floating wear-resistant liner 3 from rotating within the bushing housing 1 and ensuring reliable power transmission. Second, the "head" of the T-shaped protrusion is constrained within the "internal cavity" of the T-shaped groove, which fundamentally prevents the floating wear-resistant liner 3 from radially detaching due to vibration or centrifugal force during operation, ensuring very secure axial positioning.

[0050] In addition, this plug-in T-type mating structure makes the assembly and disassembly of the floating wear-resistant liner 3 intuitive and convenient. It can be pushed in or pulled out along the axial direction, which greatly facilitates the later maintenance and component replacement.

[0051] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0052] The specific embodiments described herein are merely illustrative of the spirit of the invention. Those skilled in the art to which this invention pertains may make various modifications or additions to the described specific embodiments or use similar methods to substitute them, without departing from the spirit of the invention or exceeding the scope defined by the appended claims.

Claims

1. A composite structure shaft sleeve device for corrosion-resistant pumps, comprising a shaft sleeve housing (1), characterized in that: The inner wall of the bushing housing (1) is provided with multiple limiting grooves (2) distributed circumferentially. The bushing housing (1) is provided with multiple independent floating wear-resistant lining blocks (3). The back of the floating wear-resistant lining block (3) is provided with a limiting protrusion (4) that is adapted to the limiting groove (2). The limiting protrusion (4) is engaged in the corresponding limiting groove (2). An elastic support unit (5) is provided between the bottom of the limiting groove (2) and the back of the floating wear-resistant liner (3). The floating wear-resistant liner (3) is supported by the elastic support unit (5) and can float radially within the bushing housing (1).

2. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, A non-linear labyrinth gap (6) is formed between adjacent floating wear-resistant liner blocks (3), and the flow channel cross section of the labyrinth gap (6) is "Z" shaped or stepped.

3. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The bushing housing (1) has at least one oil injection channel (7) connected to the bottom area of ​​the limiting groove (2), and the side or back of the floating wear-resistant liner (3) has micropores or capillary grooves (8) for guiding the lubricating medium from the oil injection channel (7) to the working surface of the floating wear-resistant liner (3).

4. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The elastic support unit (5) adopts a disc spring (9), a wave spring, or a columnar elastic rubber body.

5. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The floating wear-resistant liner (3) is made of silicon carbide ceramic or silicon nitride ceramic, and the working surface of the floating wear-resistant liner (3) is coated with a solid lubricating coating (10), with the coating thickness controlled at 10-30μm.

6. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The bushing housing (1) has annular pressure caps (11) at both axial ends, and there is an axial movement gap of 0.2-0.5mm between the inner edge of the annular pressure caps (11) and the end face of the floating wear-resistant liner (3).

7. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The floating wear-resistant liner (3) adopts at least two different sizes and shapes in the circumferential direction so that the inner hole forms a standard circle after assembly.

8. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The bushing housing (1) is made of reinforced polyetheretherketone or filled polytetrafluoroethylene.

9. The composite structure shaft sleeve device for a corrosion-resistant pump according to claim 1, characterized in that, The limiting groove (2) is a T-shaped groove, and the corresponding limiting protrusion (4) is a T-shaped protrusion. The T-shaped protrusion and the T-shaped groove cooperate with each other.

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