A kind of cooling fan tooling for overhaul of tubular generator

Abstract

The utility model relates to a kind of tool for overhauling cooling fan of tubular generator, belong to fan overhauling technical field. Including frame body;Top rod, with threaded connection mode, be provided in the frame body;Pull rod, connected to the frame body, and for and fan blade constitute connection;Wherein, the end of top rod towards fan rotating shaft has a abutment piece;The abutment piece is rotatablely connected with the end by thrust bearing. Thrust bearing only transmits the axial thrust of top rod to abutment piece without damage, so that abutment piece only carries out pure axial translation, and itself keeps from rotating. It fundamentally solves the problem that traditional pull rod end synchronous rotation wears motor rotating shaft and generates friction heat resistance.

Description

Technical Field

[0001] This utility model belongs to the field of wind turbine maintenance technology, specifically relating to a tooling for overhauling the cooling fan of a cross-flow generator. Background Technology

[0002] Axial-flow turbine generator sets, especially bulb turbine units, are key equipment in modern hydropower projects and are widely used in the development of rivers with medium to low heads. To ensure the timely dissipation of the enormous heat generated during long-term operation, the units are typically equipped with cooling systems, such as closed-loop forced self-circulation mixed ventilation systems. In this system, the cooling fans, as the core components for heat exchange, directly affect the safety and power generation efficiency of the entire generator set, especially during peak power generation periods such as summer.

[0003] As the unit operates for an extended period, the cooling fan requires regular disassembly and maintenance, such as replacing the fan bearings. The first step in this maintenance is to remove the tightly fitted fan blades from the motor shaft. However, existing disassembly methods have several drawbacks. Traditional manual disassembly, such as using a hammer or iron bar to directly strike the fan blade bushing, is not only time-consuming and labor-intensive but also easily causes irreversible mechanical damage to the fan blades and motor shaft, potentially rendering the entire fan unusable. Using general-purpose hydraulic or mechanical grippers often results in limited maintenance space, making it difficult for the grippers to apply effective force, or causing blade deformation due to improper clamping.

[0004] To achieve more precise and non-destructive disassembly, the industry commonly uses screw-type unloading tools (or "pullers"). However, these traditional unloading tools have a common structural flaw: the screw, which is the core force-applying component, rotates synchronously with the motor shaft at the end that abuts against it when the handle is turned. This synchronous rotation, under the enormous axial force, causes two serious problems:

[0005] Firstly, the lead screw end is usually made of high-hardness tool steel, while the end face of the motor shaft is relatively soft. Under high pressure, the rotating lead screw end acts like a "grinding head," continuously scraping the end face of the stationary motor shaft, causing wear, scratches, or even permanent damage to the center hole of the motor shaft, thus compromising its precision.

[0006] Secondly, and more seriously, the intense rotational friction under such high pressure generates a large amount of concentrated heat, causing the end of the motor shaft to undergo slight thermal expansion deformation due to localized heating. This expansion slightly increases the outer diameter of the motor shaft, thereby increasing the interference fit between it and the inner hole of the fan blade hub. This not only hinders the removal of the fan blades but also substantially increases the resistance to removal, making the entire disassembly process much less efficient. Utility Model Content

[0007] To address the aforementioned technical problems, this utility model provides a tooling for overhauling the cooling fan of a cross-flow generator.

[0008] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0009] A tooling for overhauling the cooling fan of a cross-flow generator is provided, comprising:

[0010] Frame;

[0011] The top rod is threaded through the frame;

[0012] A tie rod is attached to the frame and used to connect with the fan blades.

[0013] The end of the push rod facing the fan shaft has an abutment member;

[0014] The abutting member is rotatably connected to the end via a thrust bearing;

[0015] Furthermore, a friction element is provided on the end face of the abutting member that abuts against the fan shaft.

[0016] Preferably, the abutment member includes:

[0017] A base, the base being connected to the thrust bearing;

[0018] A top-mounted module, the top-mounted module being used to abut against the fan shaft via the friction element;

[0019] The top module is detachably connected to the base.

[0020] Preferably, the base has a mounting groove, and the top module has a mounting protrusion;

[0021] Furthermore, the mounting protrusion and the mounting groove are threaded together.

[0022] Preferably, the friction element comprises:

[0023] First and second layers;

[0024] The first layer is bonded and connected to the top module, and the first layer is elastic;

[0025] The second layer is bonded to the first layer and is in contact with the fan shaft.

[0026] Preferably, the surface of the second layer facing the fan shaft has a plurality of friction protrusions.

[0027] Preferably, the end of the pull rod used for connecting with the fan blades has a leveling foot;

[0028] Furthermore, the leveling foot is a ball-and-socket joint structure.

[0029] Preferably, the end of the tie rod used for connecting to the fan blade has a waist-shaped hole for inserting a connecting bolt.

[0030] Preferably, the end face of the top module that abuts against the fan shaft has:

[0031] First annular groove and second annular groove;

[0032] The first annular groove and the second annular groove are coaxial but have different diameters;

[0033] The second annular groove is used to install the friction element;

[0034] The first annular groove is used to install the magnetic suction component.

[0035] Preferably, it includes:

[0036] An actuator adapted to connect to the push rod to drive the push rod to rotate.

[0037] Preferably, the actuator is a ratchet wrench for driving the push rod to rotate in one direction.

[0038] This utility model provides a tooling for overhauling the cooling fan of a cross-flow generator. The beneficial effects of this utility model are as follows:

[0039] The abutment and the push rod form a rotatable connection. In actual operation, when the rotary handle drives the push rod to rotate, the extremely low coefficient of friction of the thrust bearing prevents the rotational motion of the push rod from being transmitted to the abutment. The thrust bearing only transmits the axial thrust of the push rod to the abutment without damage, allowing the abutment to perform only pure axial translation while remaining stationary. This fundamentally solves the problems of wear on the motor shaft and frictional thermal resistance caused by the synchronous rotation of the push rod end in traditional pullers. Attached Figure Description

[0040] Figure 1 This is the front view of the tooling for overhauling the cooling fan of the axial-flow generator proposed in this utility model.

[0041] Figure 2 for Figure 1 A magnified view of a portion at point A;

[0042] Figure 3 This is one of the structural schematic diagrams of the abutment component in the tooling for overhauling the cooling fan of the cross-flow generator proposed in this utility model;

[0043] Figure 4 This is the second schematic diagram of the abutment component in the tooling for overhauling the cooling fan of the axial-flow generator proposed in this utility model;

[0044] Figure 5 This is a schematic diagram of the friction component in the tooling for overhauling the cooling fan of the cross-flow generator proposed in this utility model.

[0045] Explanation of reference numerals in the attached figures:

[0046] 1. Frame; 2. Top rod; 3. Tie rod; 301. Leveling foot; 4. Abutment; 401. Base; 402. Top module; 5. Thrust bearing; 6. Friction component; 601. First layer; 602. Second layer; 701. First annular groove; 702. Second annular groove; 8. Operator. Detailed Implementation

[0047] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0048] Please see Figures 1-5 As shown, the specific embodiments provided by this utility model are as follows:

[0049] like Figures 1 to 5 As shown in the figure, this utility model embodiment proposes a tooling for overhauling the cooling fan of a cross-flow generator, which includes a frame 1, a top rod 2 and at least two tie rods 3.

[0050] The frame 1 serves as the basic support structure for the entire tooling. Preferably, it can be a gantry beam with a central through hole or a thick plate structure, made of high-strength alloy steel, to ensure sufficient rigidity without deformation when subjected to huge reaction forces.

[0051] The push rod 2 is a through-type lead rod with threads machined on its outer surface. The push rod 2 is threadedly connected to the central through hole of the frame 1, and the inner wall of the central through hole is also provided with threads that match the push rod 2. A rotary handle can be connected to the upper end of the push rod 2. By rotating the handle, the push rod 2 can be driven to move axially forward or backward relative to the frame 1.

[0052] The number of tie rods 3 is at least two. One end of each tie rod is fixedly or adjustablely connected to the frame 1, and the other end is used to make a firm, rigid connection, for example, with the hub of the fan blade to be disassembled during actual operation. When the push rod 2 applies a pushing force, the tie rod 3 applies a pulling force in the opposite direction to the fan blade.

[0053] Based on the above, the end of the push rod 2 facing the fan shaft is provided with an abutment 4 and a thrust bearing 5.

[0054] The abutment 4 is a component that directly or indirectly contacts the fan shaft. The thrust bearing 5 is disposed between the end face of the push rod 2 and the base 401 of the abutment 4. This creates a rotatable connection between the abutment 4 and the push rod 2. In actual operation, when the rotating handle drives the push rod 2 to rotate, due to the extremely low coefficient of friction of the thrust bearing 5, the rotational motion of the push rod 2 is not transmitted to the abutment 4. The thrust bearing 5 only transmits the axial thrust of the push rod 2 to the abutment 4 without damage, thus allowing the abutment 4 to perform only pure axial translation while remaining stationary. This fundamentally solves the problem of wear on the motor shaft and frictional thermal resistance caused by the synchronous rotation of the end of the push rod 2 in traditional pullers.

[0055] Furthermore, to enhance the stability of the contact and protect the shaft surface, a friction element 6 is fixedly provided on the end face of the contact member 4 that abuts against the fan shaft. The friction element 6 is preferably a wear-resistant pad with a high coefficient of friction, made of a polymer or hard rubber. This friction element 6, on the one hand, greatly increases the static friction between the contact member 4 and the smooth shaft end face through its high friction characteristics, effectively preventing slippage and deviation of the center point under enormous pressure; on the other hand, it possesses a certain degree of toughness, which can act as a buffer, preventing the high-hardness contact member 4 from causing indentations or damage to the shaft end face.

[0056] The working process of this utility model is as follows: First, the tie rod 3 of the tooling is fixedly connected to the fan impeller hub to be disassembled. Then, the rotating handle is rotated to advance the push rod 2, and the abutment 4 at its end (via the friction member 6) aligns and abuts with the center of the fan shaft. The handle is continued to be rotated, and as the push rod 2 rotates, its axial thrust is transmitted to the abutment 4 through the thrust bearing 5. The abutment 4 remains stationary, applying a continuously increasing axial thrust to the center of the shaft. Simultaneously, the frame 1 and the tie rod 3 apply a counter-pulling force to the fan impeller hub. Under this action and reaction force, the fan blades are smoothly disassembled from the shaft.

[0057] In this embodiment, the abutment 4 includes a base 401 and a top module 402.

[0058] The base 401 is a component directly connected to the thrust bearing 5, serving as a universal interface for connecting the push rod 2 and different functional tip modules 402. The base 401 is typically made of high-strength alloy steel to ensure the stable transmission of enormous axial thrust.

[0059] The tip module 402 is a working component that abuts against the fan shaft via the friction element 6. It is a separate, replaceable part. Therefore, as the tip module 402 is a component that directly contacts and wears, when the friction element 6 at its end wears or the tip itself is damaged due to an accident, the operator does not need to replace the entire expensive push rod 2 or abutment 4 assembly; only the lower-cost tip module 402 needs to be replaced, greatly reducing maintenance costs.

[0060] More importantly, the tip module 402 and the base 401 are detachably connected. This detachable connection can be implemented in various ways; in this embodiment, a stable and reliable threaded connection is preferred. For example, the base 401 has a mounting groove with internal threads, while the rear of the tip module 402 is integrally formed with a mounting protrusion with external threads. By screwing the mounting protrusion into the mounting groove, the tip module 402 can be quickly installed and removed from the base 401.

[0061] Users can replace the tip module 402 with different designs depending on the specific shape of the wind turbine shaft end face to be inspected. For example, a tip module 402 with a conical end face (for shafts with a center hole), a tip module 402 with a flat end face (for flat-head shafts), or a tip module 402 with a spherical end face can be used. This allows the same tooling body to be adapted to a variety of different maintenance objects, greatly expanding its application range.

[0062] In this embodiment, the friction element 6 includes a first layer 601 and a second layer 602.

[0063] The first layer 601 is an elastic buffer layer, whose inner surface is firmly bonded to the end face of the tip module 402, for example, by bonding with a high-strength industrial adhesive. Its function is that when the abutment 4 contacts the fan shaft and applies significant pressure, this elastic layer undergoes slight elastic deformation, thereby absorbing the impact and vibration during operation. More importantly, it can compensate for any minor flatness errors that may exist between the end face of the tip module 402 and the end face of the shaft, ensuring full surface contact between the two and avoiding stress concentration caused by hard-on-hard contact, thus maximizing the protection of the shaft end face from pressure damage. Preferably, the first layer 601 can be made of materials with good elasticity and resistance to compression set, such as polyurethane rubber or silicone rubber.

[0064] The second layer 602 is a wear-resistant friction layer. Its inner surface is bonded to the outer surface of the first layer 601, while its outer surface is the working surface that ultimately comes into direct contact with the fan shaft during operation. The main function of this second layer 602 is to provide an extremely high static friction coefficient, ensuring that the tooling contact point will not slip off the smooth metal shaft center under enormous axial pressure, thus guaranteeing operational stability and safety. Simultaneously, the material hardness of this layer must be lower than that of the metal material of the motor shaft to ensure that it will not scratch or wear the shaft under any circumstances, while also possessing sufficient wear resistance to extend its service life. Preferably, the second layer 602 can be made of a composite polymer material or a fabric-reinforced resin (such as phenolic laminate).

[0065] In a preferred embodiment, the surface of the second layer 602 facing the fan shaft has several friction protrusions to increase friction.

[0066] In this embodiment, the end of the pull rod 3 used for connecting with the fan blades is provided with a leveling foot 301.

[0067] Specifically, the preferred implementation of the leveling foot 301 is a ball-and-socket joint structure. This structure mainly includes a ball head integrally formed with the end of the pull rod 3, and a stop for direct contact with the surface of the fan blade hub. The stop has a socket inside that matches the ball head, and the ball head is accommodated inside the socket.

[0068] Through this ball-and-socket joint structure, the abutment foot can rotate omnidirectionally relative to the pull rod 3. In actual operation, when the leveling foot 301 is placed on the hub surface of the fan blade, regardless of whether the surface has a certain tilt angle or local unevenness, the flat bottom surface of the abutment foot can always adjust its posture to achieve maximum contact area with the contact surface. At the same time, the ball-and-socket joint allows the pull rod 3 itself to maintain its original posture parallel to the entire frame 1 without deflection due to the tilt of the abutment foot.

[0069] In this embodiment, the end of the pull rod 3 that is used to connect with the fan blade has a through hole for the connecting bolt, which is a slotted hole.

[0070] The oblong or racetrack-shaped through hole is typically arranged radially along the tie rod 3. In actual operation, the connecting bolts used to fix the tie rod 3 to the fan impeller hub pass through this oblong hole and are then tightened with nuts.

[0071] Fan blades from different manufacturers or batches may have slight differences in the radial distance from the center point of the threaded hole specifically used for installing and removing tools. Traditional circular through holes can only accommodate one fixed hole spacing, while the oblong hole in this embodiment allows the connecting bolt to slide and be positioned within the length of the hole. This allows the same tie rod 3 to easily accommodate fan blades with various radial hole spacings, eliminating the need to prepare different tooling or accessories for different fan blade models.

[0072] In this embodiment, two coaxial annular grooves 701 and 702 with different diameters are machined on the end face of the top module 402.

[0073] The first annular groove 701 is used to install a magnetic chuck. This magnetic chuck is preferably a ring-shaped or multi-segmented arc-shaped permanent magnet, for example, made of rare-earth permanent magnet materials such as neodymium iron boron. Its function is to increase the stability of the connection between the top module 402 and the fan shaft.

[0074] The second annular groove 702 is used to install the aforementioned friction element 6.

[0075] In this embodiment, the upper end of the push rod 2 is a drive head that can cooperate with a standard drive tool, such as a square drive head or a hexagonal drive head.

[0076] The actuator 8 that cooperates with the drive head is preferably a ratchet wrench. In actual operation, the sleeve end of the ratchet wrench is connected to the drive head of the push rod 2. The operator only needs to swing the handle of the ratchet wrench back and forth within a limited angle to achieve continuous, unidirectional rotational drive of the push rod 2.

[0077] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A tooling fixture for overhauling the cooling fan of a cross-flow generator, characterized in that, include: Frame; The top rod is threaded through the frame; A tie rod is attached to the frame and used to connect with the fan blades. The end of the push rod facing the fan shaft has an abutment member; The abutting member is rotatably connected to the end via a thrust bearing; Furthermore, a friction element is provided on the end face of the abutting member that abuts against the fan shaft.

2. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 1, characterized in that, The abutment includes: A base, the base being connected to the thrust bearing; A top-mounted module, the top-mounted module being used to abut against the fan shaft via the friction element; The top module is detachably connected to the base.

3. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 2, characterized in that, The base has a mounting groove, and the top module has a mounting protrusion. Furthermore, the mounting protrusion and the mounting groove are threaded together.

4. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 3, characterized in that, The friction element includes: First and second layers; The first layer is bonded and connected to the top module, and the first layer is elastic; The second layer is bonded to the first layer and is in contact with the fan shaft.

5. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 4, characterized in that, The second layer has several friction protrusions on its surface facing the fan shaft.

6. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 1, characterized in that, The end of the pull rod that connects to the fan blades has a leveling foot. Furthermore, the leveling foot is a ball-and-socket joint structure.

7. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 6, characterized in that, The end of the tie rod that connects to the fan blades has a waist-shaped hole for inserting connecting bolts.

8. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 2, characterized in that, The end face of the top module that abuts against the fan shaft has: First annular groove and second annular groove; The first annular groove and the second annular groove are coaxial but have different diameters; The second annular groove is used to install the friction element; The first annular groove is used to install the magnetic suction component.

9. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 1, characterized in that, include: An actuator adapted to connect to the push rod to drive the push rod to rotate.

10. The tooling for overhauling the cooling fan of the axial-flow generator according to claim 9, characterized in that, The actuator is a ratchet wrench, used to drive the push rod to rotate in one direction.

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