Fan axial retainer and fan bearing

Abstract

The invention provides a fan axial retainer and a fan bearing, relates to the field of fan bearings, and aims to solve the problem that integral roundness and operation stability are difficult to guarantee due to rigid bolt connection or unconstrained free splicing of an existing sectional retainer, and adopts a sectional design of splicing a plurality of fan-ring-shaped single bodies into a ring to replace an integral structure. The dimension specification of a single component is reduced; the retainer is divided into a plurality of small fan-ring-shaped single bodies, the manufacturing difficulty of each single body is remarkably reduced along with size reduction, the utilization rate of raw materials is increased, heating is more uniform during heat treatment, and buckling deformation is not prone to occurring; meanwhile, the transportation and installation difficulty of small monomers is greatly reduced, and the problem that transportation and installation are damaged due to the fact that the size and weight of an integral structure are too large is solved; the adjacent single bodies are in floating connection through the butt joint parts, and a certain relative movement space is reserved, so that the whole retainer has certain flexible deformation capacity.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of fan bearings, in particular to a fan axial retainer and fan bearing. BACKGROUND

[0002] With the rapid development of wind power generation technology towards large power and megawatt level, the load of the main bearing of the wind turbine is increasing. Three-row roller bearings are widely used in the main shaft system of large wind turbines because they can simultaneously bear huge axial force, radial force and overturning moment, and have the advantages of high load capacity and compact structure. In three-row roller bearings, the retainer is one of the core components, which mainly functions to isolate adjacent rollers, guide roller operation and improve internal lubrication of the bearing. However, the main shaft bearing of the fan is usually installed at high altitude, and the working environment is extremely harsh, and it needs to bear complex stress caused by variable wind load, gust impact and deformation of the main shaft for a long time. Especially the axial retainer, while bearing its own centrifugal force, also needs to cope with the huge extrusion and impact load of the roller. Once the retainer is damaged or broken, it will directly lead to bearing failure, causing huge downtime maintenance cost and economic loss.

[0003] At present, for the retainer of large fan main shaft bearing, the traditional technology mainly adopts integral metal retainer or simple segmented retainer. For the integral retainer, as the diameter of the bearing increases, the manufacturing difficulty increases exponentially, not only the raw material is wasted seriously, the heat treatment is easy to warp, and it is easy to be damaged during transportation and installation; and due to the rigidity of the integral structure, when the fan main shaft is deformed or subjected to impact load, it cannot buffer stress through flexible deformation, and stress concentration is easy to occur, which leads to fracture. While the existing segmented retainer solves the problem of manufacturing and transportation, but most of them use rigid bolt connection or unconstrained free splicing method, the rigid connection is easy to loosen or break at the connection under complex stress; unconstrained splicing leads to poor consistency of segmented monomers during operation, and is easy to cause the phenomenon of scattered retainer, different steps of each segment or violent collision with the roller, which is difficult to ensure the roundness and operation stability of the whole retainer. SUMMARY

[0004] Therefore, the present application provides a fan axial retainer and fan bearing, which reduces the manufacturing difficulty of large fan bearing retainer, realizes flexible stress buffering, and ensures the overall operation stability.

[0005] The first object of the present application is to provide a fan axial retainer, which adopts the following scheme: Comprising: The monomer is a fan ring plate and is provided with a plurality of fan ring arc direction two ends respectively provided with a butt joint part, at least one rolling groove is arranged between the two end butt joint parts, a roller is installed and matched in the rolling groove, adjacent monomers are connected through the butt joint part, and all the monomers are spliced into a ring along the fan ring arc line corresponding to the ring. The stable ring comprises an inner stable ring and an outer stable ring, the inner stable ring is connected to the inner ring of the ring-shaped monomer, and the outer stable ring is sleeved and connected to the outer ring of the ring-shaped monomer.

[0006] Further, the roller in the rolling groove is in a cylindrical shape, the roller can rotate along the axis line thereof, and the rotation axis line of the roller is distributed along the radial direction of the corresponding monomer.

[0007] Further, three rolling grooves are arranged on the monomer in sequence and at intervals, and two rollers distributed along the radial direction of the monomer are respectively arranged in each rolling groove.

[0008] Further, a weight-reducing groove is arranged on the end face of the monomer in the axial direction of the ring-shaped monomer, and the roller axis line is respectively protruded from the end face of the corresponding side of the monomer.

[0009] Further, the inner stable groove for embedding the inner stable ring is arranged on the inner arc side of the monomer connected to the inner stable ring, Further, the outer stable groove for embedding the outer stable ring is arranged on the outer arc side of the monomer connected to the outer stable ring.

[0010] Further, the connecting hole is arranged on the inner ring and the outer ring of the corresponding ring-shaped monomer, the inner stable ring and the outer stable ring are installed on the monomer through the fastener and the connecting hole, and each monomer is connected to the inner stable ring and the outer stable ring through at least two fasteners.

[0011] Further, the butt joint part is a dovetail-shaped groove or a dovetail-shaped block, one end of the monomer is the dovetail-shaped groove, the other end is the dovetail-shaped block, and adjacent monomers are connected by inserting the dovetail-shaped block into the dovetail-shaped groove.

[0012] Further, a gap is left between the dovetail-shaped groove and the dovetail-shaped block to form relative floating.

[0013] The second object of the application is to provide a fan bearing using the fan axial retainer provided in the first object.

[0014] Compared with the prior art, the application has the advantages and positive effects that: To address the issue that existing segmented cages, which rely on rigid bolt connections or unrestrained free splicing, struggle to guarantee overall roundness and operational stability, a segmented design is adopted. This design uses multiple fan-shaped annular units spliced ​​together to form a ring, replacing the monolithic structure and reducing the size of individual components. The cage is divided into multiple small fan-shaped annular units, significantly reducing the manufacturing difficulty of each unit as its size decreases, improving raw material utilization, and ensuring more uniform heating during heat treatment, thus reducing the likelihood of warping. Simultaneously, the transportation and installation difficulty of these smaller units is greatly reduced, avoiding the damage issues caused by the excessive size and weight of monolithic structures during transport and installation. Adjacent units are connected by a floating joint, maintaining a certain relative space for movement, giving the cage a degree of flexibility. When the fan shaft flexes or is subjected to impact loads, the floatingly connected units can adapt to stress changes through slight relative displacement, dispersing and buffering concentrated stress through flexible deformation, preventing stress concentration and fracture caused by excessive rigidity. The assembled units are constrained by inner and outer double stabilizing rings. Floating connections replace rigid bolt connections and unconstrained splicing, balancing connection flexibility with overall constraint. After multiple units are spliced ​​into a ring through floating connections at the docking points, the inner and outer stabilizing rings fix all units from the inner and outer rings respectively, forming overall constraint and preventing displacement deviations during operation. The floating connection method avoids the risk of loosening and breakage of rigid bolt connections under complex stresses and solves the problem of poor unit consistency caused by unconstrained splicing, ensuring that all units operate synchronously, maintaining the overall roundness of the cage, and preventing disintegration, asynchronous operation, or violent collisions with the rollers. Attached Figure Description

[0015] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0016] Figure 1 This is a schematic diagram of a single unit of the axial retainer for a wind turbine in one or more embodiments of the present invention.

[0017] Figure 2 This is a schematic diagram of the structure of two units connected together in one or more embodiments of the present invention.

[0018] Figure 3 This is a schematic diagram of monomers being spliced ​​together to form a ring monomer in one or more embodiments of the present invention.

[0019] Among them, 1. Monomer; 2. Connecting hole; 3. Inner stabilizing groove; 4. Dovetail block; 5. Dovetail groove; 6. Rolling groove; 7. Inner stabilizing ring; 8. Outer stabilizing ring; 9. Fastener; 10. Weight reduction groove; 11. Roller; 12. Ring-forming monomer. Detailed Implementation

[0020] Embodiment 1 In one exemplary embodiment of the present application, as shown in Figures 1-3 a fan axial holder is provided.

[0021] The fan axial holder provided in this embodiment can not only reduce manufacturing difficulty, but also realize flexible buffering and ensure overall operation stability through structural optimization.

[0022] As shown in Figure 1 a fan axial holder mainly includes a single body 1 and a stabilizing ring. A plurality of single bodies 1 are spliced into a ring, and the stabilizing ring is installed at the inner and outer rings of the ringed single bodies 12.

[0023] The single body 1 is a fan ring-shaped plate member and is provided with a plurality of abutting portions at both ends along the fan ring arc direction. At least one rolling groove 6 is provided between the two abutting portions. A roller 11 is installed and matched in the rolling groove 6. The adjacent single bodies 1 are connected by the abutting portions. All single bodies 1 are spliced into a ring along the corresponding ring direction of the fan ring arc.

[0024] The stabilizing ring includes an inner stabilizing ring 7 and an outer stabilizing ring 8. The inner stabilizing ring 7 is connected to the inner ring of the ringed single bodies 12, and the outer stabilizing ring 8 is sleeved and connected to the outer ring of the ringed single bodies 12.

[0025] In actual application, the single body 1 is a segmented structure unit, which adopts a fan ring-shaped plate member and can form a complete ring-shaped frame as the ringed single bodies 12 by splicing a plurality of single bodies 1. Specifically, the number of single bodies 1 can be adjusted according to the actual size requirements of the bearing. For example, in a large wind turbine generator, the number of single bodies 1 can be set to 6 to 12 to meet the manufacturing and assembly requirements. The abutting portion enables the adjacent single bodies 1 to be connected in a floating manner.

[0026] The rolling groove 6 is used to install the roller 11, guide the movement of the roller 11, and isolate adjacent rollers 11 to avoid collision of the rollers 11 during operation. The cross-sectional shape of the rolling groove 6 can be designed as U-shaped or V-shaped to adapt to different types of roller 11 installation requirements. In addition, the installation method of the roller 11 can also be realized by other forms, such as setting a limiting stop edge or a buckle structure in the rolling groove 6 to ensure the positional stability of the roller 11 during operation.

[0027] The stabilizing ring is used to constrain the position of the single body 1 and ensure the roundness and operation synchronization of the holder as a whole. Specifically, the inner stabilizing ring 7 and the outer stabilizing ring 8 can be fixedly connected with the single body 1 by embedded connection, welding or adhesion, etc. The material of the stabilizing ring can be selected as metal or composite material to meet different strength and wear resistance requirements.

[0028] The segmented single body 1 design combined with the floating connection mechanism and the stabilizing ring structure effectively solves the problem of damage to the cage of the fan main shaft bearing under complex stress environment. The segmented single body 1 design significantly reduces the manufacturing difficulty of large cages, avoiding the inherent defects of the integral structure in material utilization, heat treatment deformation, and transportation and installation. The floating connection mechanism allows the single body 1 to produce a controllable small displacement when bearing the deflection deformation or impact load of the main shaft, thereby dispersing the local stress and buffering the load impact, preventing stress concentration and fracture caused by rigid connection. The stabilizing ring effectively constrains the position of the single body 1, ensuring the roundness and synchronization of the cage as a whole, avoiding the phenomenon of asynchronization or deviation of the segmented single body 1 in high-speed rotation. Thus, the reliable operation and long-term stability of the cage can be achieved under harsh working conditions.

[0029] As shown in Figure 2 , the rollers 11 in the rolling grooves 6 are cylindrical, and the rollers 11 can rotate along their axis, and the rotation axis of the rollers 11 is distributed along the radial direction of the corresponding single body 1.

[0030] Among them, the roller 11 is a rotating body with a uniform cross section, which can be made of high-hardness alloy steel or ceramic material, providing good wear resistance and pressure resistance. The cylindrical structure ensures that the contact area of the roller 11 is uniform during rolling, avoiding stress concentration and abnormal wear caused by irregular shape. By optimizing the fitting gap between the roller 11 and the rolling groove 6, reducing sliding friction, and improving operating efficiency. The rotation axis of the roller 11 is distributed along the radial direction of the corresponding single body 1, so that the roller 11 can be correctly aligned in the radial direction inside the bearing, thereby uniformly distributing the load and preventing eccentric wear and impact damage.

[0031] As shown in Figure 1 , three rolling grooves 6 are arranged on the single body 1, and two rollers 11 are arranged in each rolling groove 6 along the radial direction of the single body 1.

[0032] Specifically, the rolling groove 6 is a concave structure formed on the surface of the single body 1 for accommodating and guiding the roller 11, which can be realized by machining, casting or stamping forming, etc. In practical application, the shape and size of the rolling groove 6 should match the roller 11 to ensure that the roller 11 can rotate smoothly and maintain a stable trajectory, optimize load distribution, and avoid stress concentration. The roller 11 is a cylindrical rolling body installed in the rolling groove 6, and the size precision and surface finish are ensured by precision machining to improve the carrying capacity and running stability.

[0033] Three rolling grooves 6 are arranged on the monomer 1 in sequence, which ensures the uniform arrangement of the grooves on the monomer 1, effectively disperses the load, and avoids local stress concentration. Two radially distributed rollers 11 are installed in each rolling groove 6, which not only increases the number of rollers 11 to improve the overall carrying capacity, but also aligns the rotation axis of the rollers 11 with the monomer 1 radially, optimizes the running track of the rollers 11, reduces the risk of collision and instability that may occur during operation, and significantly enhances the overall stability and reliability of the retainer. Through the cooperation of multiple rolling grooves 6, double rollers 11, and the use of the butt joint part and the stabilizing ring, the impact resistance and flexible buffering performance of the retainer under complex working conditions are improved, thereby better adapting to the working environment of the fan main shaft bearing.

[0034] As shown in Figure 1 and Figure 2 , the monomer 1 is provided with a weight reduction groove 10 on the end face along the ring monomer 12 axis, and the axis of the roller 11 is protruded from the corresponding side of the monomer 1 end face.

[0035] The weight reduction groove 10 is a recessed area with a certain depth and shape provided on the end face of the monomer 1, which can be realized by using a rectangular groove, an arc-shaped groove, or other regular or irregular shaped groove body, which can effectively reduce the material usage of the monomer 1, thereby reducing the overall weight. Among them, the axis of the roller 11 is protruded from the corresponding side of the monomer 1 end face, so that the roller 11 can contact the inner and outer rings of the bearing to realize support, and the lubricating oil can enter the rolling groove 6, which is also helpful for heat dissipation.

[0036] By providing the weight reduction groove 10 on the end face of the monomer 1, the weight of the monomer 1 is significantly reduced, thereby reducing the centrifugal force generated during high-speed operation of the fan, improving the stability and service life of the retainer.

[0037] As shown in Figure 1 , the inner stabilizing groove 3 is provided on the inner arc side of the monomer 1 for embedding the inner stabilizing ring 7. The inner stabilizing groove 3 is a groove structure provided on the inner arc side of the monomer 1 for accommodating and fixing the inner stabilizing ring 7, which can be realized by using a rectangular groove, a trapezoidal groove, or other groove type with mechanical interlocking function. The inner stabilizing groove 3 provides accurate positioning and stable embedding space for the inner stabilizing ring 7, thereby effectively preventing radial displacement caused by centrifugal force or impact load during operation of the fan, and avoiding stress concentration problems caused by position deviation.

[0038] By setting a dedicated inner stabilizing groove 3 on the inner arc side of unit 1, an embedded connection between the inner stabilizing ring 7 and unit 1 is achieved. This not only significantly enhances the bonding strength between the two but also provides necessary flexible buffering through the cooperation of the groove and the inner stabilizing ring 7 when the wind turbine main shaft undergoes flexural deformation or is subjected to impact loads. Simultaneously, the way the inner stabilizing ring 7 cooperates with unit 1 is compatible with the fan-shaped annular structure of unit 1 and the floating connection characteristics of the mating part, jointly improving the overall operational stability and impact resistance of the cage. It is particularly suitable for the working environment of large wind turbine main shaft bearings, effectively solving the problem of weak connections in traditional structures and ensuring that the cage maintains stable roundness and consistency during long-term operation.

[0039] Similarly, the outer stabilizing ring 8 has an outer stabilizing groove on the outer arc side of the connecting unit 1 for embedding. The outer stabilizing ring 8 is an annular component used to enhance the overall stability of the cage. It can be made of metal and its purpose is to improve the cage's resistance to deformation under complex working conditions. The outer stabilizing groove refers to the groove structure set at the connection of the outer stabilizing ring 8. It can be formed by machining and its purpose is to increase the connection contact area and fixing strength, preventing loosening or detachment due to vibration or impact loads.

[0040] like Figure 2 As shown, the inner and outer rings of the ring-shaped monomer 12 are provided with connecting holes 2. The inner stabilizing ring 7 and the outer stabilizing ring 8 are installed on the monomer 1 through fasteners 9 and the connecting holes 2. Each monomer 1 is connected to the inner stabilizing ring 7 and the outer stabilizing ring 8 by at least two fasteners 9.

[0041] Connecting holes 2 are provided on unit 1 to cooperate with fasteners 9 for mechanical locking. Connecting holes 2 can be through holes or threaded holes, and can be circular, elliptical, or other hole shapes adapted to the shape of fasteners 9. In practical applications, the position and number of connecting holes 2 can be optimized according to the size and stress requirements of unit 1, providing precise installation points for fasteners 9, thereby avoiding problems such as inaccurate positioning or missing connection points that may result from relying solely on embedded connections. Fasteners 9 can be bolts, screws, or other connectors with mechanical locking functions, enhancing the connection's strength and impact resistance, preventing loosening during vibration or load changes. Furthermore, the multiple fastening points allow for even force distribution, improving the overall connection reliability and ensuring that unit 1 remains stable and consistent during operation.

[0042] By creating connection holes 2 on the inner and outer rings of unit 1 and using fasteners 9 to mechanically lock the inner stabilizing ring 7 and outer stabilizing ring 8 to unit 1, a stable integral structure is formed. This not only solves the problem of easy loosening of embedded connection methods under the complex stress of wind turbines, but also achieves uniform force distribution through the distribution of multiple fastening points, significantly improving the impact resistance and stability of the connection.

[0043] Each monomer 1 is connected with the inner stabilizing ring 7 and the outer stabilizing ring 8 respectively by at least two fasteners 9, which enhances the consistency and reliability of the overall structure, effectively deals with the huge impact and vibration in the operation of the fan, and ensures the long-term stable operation of the retainer under complex working conditions.

[0044] As shown in Figure 2 , the butt joint part is a dovetail-shaped groove 5 or a dovetail-shaped block 4, one end of the monomer 1 is a dovetail-shaped groove 5 and the other end is a dovetail-shaped block 4, and adjacent monomers 1 are connected by inserting the dovetail-shaped block 4 into the dovetail-shaped groove 5.

[0045] The butt joint part is used to realize the floating connection between adjacent monomers 1, which can be realized in the form of a dovetail-shaped groove 5 or a dovetail-shaped block 4. In actual application, the dovetail-shaped groove 5 and the dovetail-shaped block 4 can provide a mechanical locking function to prevent disengagement, while allowing relative movement to achieve the purpose of floating connection. The complementary pairing mode of one end of the monomer 1 being a dovetail-shaped groove 5 and the other end being a dovetail-shaped block 4 facilitates quick assembly and ensures the reliability of the connection.

[0046] Specifically, the matching design between the dovetail-shaped groove 5 and the dovetail-shaped block 4 not only realizes the firm connection of adjacent monomers 1, but also allows a certain degree of relative floating through the reserved gap, thereby adapting to the deformation and impact load of the fan main shaft under complex working conditions, effectively avoiding the stress concentration problem caused by rigid connection, and overcoming the risk of scattered shelves caused by unconstrained splicing. On this basis, the monomer 1 is connected by inserting the dovetail-shaped block 4 into the dovetail-shaped groove 5, which not only ensures the roundness and running stability of the overall structure, but also can buffer stress through flexible deformation when bearing variable wind load and gust impact, significantly improving the reliability and service life of the retainer.

[0047] A gap is left between the matching dovetail-shaped groove 5 and the dovetail-shaped block 4 to form relative floating. The gap refers to the space distance reserved in the matching area of the dovetail-shaped groove 5 and the dovetail-shaped block 4, which can be realized in micrometer or millimeter control mode. In actual application, the specific value of the gap can be adjusted according to the actual working condition of the fan shaft bearing, and the space is reserved to avoid rigid contact, thereby allowing adjacent monomers 1 to produce a small displacement under complex stress. The relative floating is the flexible movement between adjacent monomers 1 within a certain range, which can be optimized in performance through the design of the gap and the selection of materials, with the purpose of absorbing the stress caused by the deformation of the fan shaft and reducing the risk of stress concentration.

[0048] Embodiment 2 In another typical embodiment of the present application, as shown in Figures 1-3 , a fan bearing is given, which uses the fan axial retainer as in embodiment 1.

[0049] The inner ring and the outer ring of the fan bearing are mounted with a fan axial retainer, which cooperates with a fan radial retainer to realize stable support of the inner ring and the outer ring.

[0050] By combining the segmented monomer 1 design with the floating connection mechanism, and introducing the structural constraints of the inner stabilizing ring 7 and the outer stabilizing ring 8, the problem that the retainer of the fan main shaft bearing is easily damaged under complex stress environment is effectively solved. The segmented monomer 1 design significantly reduces the manufacturing difficulty of the large retainer, and avoids the inherent defects of the integral structure in raw material utilization, heat treatment deformation and transportation and installation.

[0051] The above only describes the preferred embodiments of the present application and is not used to limit the present application. For those skilled in the art, the present application can have various modifications and changes. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A fan axial cage, characterized by, The application relates to a fan axial retaining frame. The single body is a fan ring plate and is provided with a plurality of the single bodies, and the two ends of the single body along the fan ring arc direction are respectively provided with butt joints, at least one rolling groove is arranged between the two butt joints, rollers are mounted in the rolling groove in a matched mode, adjacent single bodies are connected in a floating mode through the butt joints, and all the single bodies are spliced into a ring along the fan ring arc direction. The stable ring comprises an inner stable ring and an outer stable ring, the inner stable ring is connected to the inner ring of the single body, and the outer stable ring is sleeved and connected to the outer ring of the single body.

2. The axial fan cage of claim 1, wherein, The roller in the rolling groove is in a cylindrical type, the roller can rotate along the axis, and the rotating axis of the roller is distributed along the radial direction of the corresponding single body.

3. The axial fan cage of claim 2, wherein, Three rolling grooves are arranged on the single body in a sequentially spaced mode, and two rollers distributed along the radial direction of the single body are respectively arranged in each rolling groove.

4. The axial cage of claim 1 or 2 or 3, wherein, A weight-reducing groove is arranged on the end face of the single body along the axial direction of the single body, and the roller axis is protruded from the end face of the corresponding single body on both sides.

5. The axial fan cage of claim 1, wherein, An inner stable groove for embedding the inner stable ring is arranged on the inner arc side of the single body connected to the inner stable ring.

6. The axial fan cage of claim 1 or 5, wherein, An outer stable groove for embedding the outer stable ring is arranged on the outer arc side of the single body connected to the outer stable ring.

7. The axial fan cage of claim 6, wherein, Connecting holes are arranged on the inner ring and the outer ring of the single body corresponding to the single body, the inner stable ring and the outer stable ring are mounted on the single body through fasteners matched with the connecting holes, and each single body is connected to the inner stable ring and the outer stable ring through at least two fasteners.

8. The axial fan cage of claim 1, wherein, The butt joint is in a dovetail groove or a dovetail block, one end of the single body is in a dovetail groove, the other end is in a dovetail block, and adjacent single bodies are connected by inserting the dovetail block into the dovetail groove.

9. The axial fan cage of claim 8, wherein, A gap is left between the dovetail groove and the dovetail block to form a relative floating mode.

10. A fan bearing, characterized by The fan axial retaining frame is used.

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