An assembly for a turbine wheel

Abstract

The utility model relates to fan transmission system technical field, and disclose a kind of assembly impeller, including impeller and main shaft, the detachable connection between the impeller and main shaft, at least two symmetrical distribution's protruding tooth is processed in the main shaft end face;The recess matched with the protruding tooth is opened in the impeller body end face, and torque is transferred by the side surface contact of the protruding tooth and recess;The utility model is matched by protruding tooth and recess, and contact area is big, can effectively disperse torque, reduce local stress concentration;Symmetrical distribution's protruding tooth makes stress more balanced, avoids the local failure caused by structural deviation.

Description

Technical Field

[0001] This utility model relates to the technical field of fan transmission systems, specifically to an assembled impeller. Background Technology

[0002] In the development of wind turbine drive systems, the connection structure between the impeller and the main shaft is the core component ensuring power transmission. Early on, the industry mostly used single-key connections, utilizing a single keyway and key to transmit torque. As wind turbines have evolved towards higher speeds and higher loads, the requirements for the reliability and stability of the impeller-main shaft connection have continuously increased. Double-key connections have gradually become the mainstream, theoretically optimizing force distribution by sharing the torque between the two keys.

[0003] However, traditional double-key connections and similar key connection structures have significant shortcomings: They are sensitive to machining precision: Double-key connections have extremely high requirements for the position and dimensional tolerances of the keyway. Even slight deviations can lead to severe uneven stress on the double keys, causing some keys to fatigue prematurely and significantly shortening the service life of the connection structure; they have weak impact and variable load resistance: relying on static friction to transmit torque, they are prone to micro-slippage between the key and keyway when faced with sudden load changes (such as airflow impact or instantaneous load changes). This not only affects the accuracy of power transmission but may also cause plastic deformation of the keyway due to instantaneous overload, resulting in permanent fit failure and equipment malfunction; assembly and maintenance are inconvenient: key connections require precise alignment of the key and keyway during assembly, which is difficult to perform; after a failure, disassembling, replacing the key, or repairing the keyway is time-consuming and labor-intensive, increasing maintenance costs and downtime. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an assembly impeller that improves the reliability and stability of the connection between the impeller and the main shaft, simplifies the assembly and maintenance process, and ensures the power transmission efficiency of the fan. It also solves the problems of traditional keyed connections, such as sensitivity to machining precision, weak impact and variable load capacity, and inconvenient operation and maintenance.

[0005] To achieve the aforementioned goals of improving the reliability and stability of the impeller-main shaft connection, simplifying assembly and maintenance processes, and ensuring the power transmission efficiency of the wind turbine, this utility model provides the following technical solution: an assembly impeller, comprising an impeller and a main shaft, wherein the impeller and the main shaft are detachably connected, and the end face of the main shaft is machined with at least two symmetrically distributed protrusions; the end face of the impeller body is provided with a groove matching the protrusions, and torque is transmitted through the side contact between the protrusions and the groove.

[0006] Preferably, a bolt groove is provided between the impeller and the main shaft, and a connecting bolt is installed in the bolt groove. The connecting bolt passes through the main shaft and the impeller, and the impeller body and the main shaft are assembled and fitted together by axial tension.

[0007] Preferably, the impeller and the connecting bolt are fixedly connected by a lock nut.

[0008] Preferably, the protruding teeth are rectangular in structure, and there are two in number, symmetrically distributed on the end face of the main shaft.

[0009] Preferably, the impeller front end is provided with a guide cone.

[0010] Preferably, the guide cone is a curved surface and smoothly connects with the curved surface of the impeller.

[0011] Preferably, the other end of the main shaft is connected to a speed increaser.

[0012] Compared with the prior art, the present invention provides an assembly impeller with the following advantages:

[0013] 1. This impeller assembly, with its teeth and grooves engaging, features a large contact area that effectively disperses torque and reduces localized stress concentration. The symmetrically distributed teeth ensure more even force distribution, preventing localized failures due to structural deviations and making it suitable for high-speed rotation and high-torque transmission scenarios. The mechanical engagement of the teeth and grooves, combined with the preload of the axial connecting bolts, prevents micro-slippage of the connection structure under sudden loads, significantly reducing the risk of keyway plastic deformation and ensuring power transmission stability and equipment reliability. During assembly, aligning the teeth and grooves is less difficult than with traditional keyways. Disassembly only requires loosening the lock nut and removing the connecting bolts to separate the impeller from the main shaft, eliminating the need for complex keyway repair or replacement, thus significantly reducing maintenance time and costs. Attached Figure Description

[0014] Figure 1 This is a sectional view of the impeller main shaft structure of this utility model;

[0015] Figure 2 This is a schematic diagram of the impeller part of this utility model;

[0016] Figure 3 This is a schematic diagram of the main shaft part of this utility model;

[0017] Figure 4 This is a schematic diagram of the assembly structure of the impeller and main shaft of this utility model.

[0018] In the diagram: 1. Main shaft; 11. Tooth; 2. Impeller; 21. Bolt groove; 22. Groove; 3. Connecting bolt; 4. Locking nut; 5. Guide cone. Detailed Implementation

[0019] 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.

[0020] like Figures 1-4 As shown, an assembly impeller 2 includes an impeller 2 and a main shaft 1, which are detachably connected. The end face of the main shaft 1 is machined with two symmetrically distributed protrusions 11. The end face of the impeller 2 body is provided with a groove 22 that matches the protrusions 11. Torque is transmitted through the side contact between the protrusions 11 and the groove 22. Compared with simply relying on bolt connection to transmit torque, the direct contact between the protrusions 11 and the side of the groove 22 results in a larger contact area and concentrated force, which can efficiently transmit the rotational power of the main shaft 1 to the impeller 2, reduce torque loss caused by friction or thread deformation, and improve transmission efficiency. The protrusions 11 and the groove 22 undertake the main torque transmission task, which can significantly reduce the shear force and torsional force on the connecting bolts 3, avoid fatigue damage to the bolts due to long-term excessive torque, extend the service life of the bolts, and improve the reliability of the connection structure. During installation, the protrusions 11 are embedded in the groove 22 to achieve precise circumferential positioning of the impeller 2 and the main shaft 1, ensuring that their rotation centers are consistent and avoiding vibration and wear caused by eccentricity. Meanwhile, during equipment operation, the protruding teeth 11 and the grooves 22 engage with each other, effectively preventing the impeller 2 from rotating circumferentially relative to the main shaft 1, thus preventing loosening and enhancing connection stability. Since the protruding teeth 11 and grooves 22 only bear torque transmission and do not bear the main axial tensile force (the axial tensile force is borne by the bolts), during disassembly, simply loosening the connecting bolts 3 is sufficient to separate the impeller 2 from the main shaft 1, simplifying the disassembly process and facilitating equipment maintenance and repair. This torque transmission method eliminates the need for additional complex transmission components, making the connection structure between the impeller 2 and the main shaft 1 more compact, reducing the overall size and weight of the equipment, and making it suitable for applications with strict space and weight requirements.

[0021] like Figure 1As shown, a bolt groove 21 is provided between the impeller 2 and the main shaft 1. A connecting bolt 3 is installed in the bolt groove 21. The connecting bolt 3 passes through the main shaft 1 and the impeller 2, and the impeller 2 body is assembled and fitted with the main shaft 1 by axial tension. The impeller 2 and the connecting bolt 3 are fixedly connected by a lock nut 4. During the rotation of the impeller 2, it will be subjected to dynamic loads such as centrifugal force and vibration. The lock nut 4 can increase the friction of the threaded connection by applying preload, so as to prevent the connecting bolt 3 from loosening due to vibration or load changes, and ensure the connection stability between the impeller 2 and the main shaft 1. The connecting bolt 3 uses axial tension to fit the impeller 2 and the main shaft 1. After the lock nut 4 is fixed, it can maintain this tension continuously, preventing the impeller 2 from displacing from the main shaft 1 in the axial direction, ensuring the tightness of the assembly and fitting, and avoiding abnormal operating noise, wear or reduced power transmission efficiency caused by gaps.

[0022] like Figure 1 As shown, a guide cone 5 is provided at the front end of the impeller 2; the guide cone 5 is curved and smoothly connects with the curved surface of the impeller 2; the curved transition of the guide cone 5 allows the gas to smoothly transition along the surface of the guide cone to the inlet of the impeller 2, reducing turbulence and eddies caused by sudden turning or impact of the gas, reducing energy loss at the inlet, and allowing the gas to flow into the flow channel between the blades of the impeller 2 at a more ideal angle and speed, thereby improving the gas dynamic performance; the uniform gas inflow state allows the blades of the impeller 2 to absorb gas energy more efficiently, reducing energy loss caused by flow turbulence, thereby improving the overall efficiency of the impeller 2 and reducing energy consumption.

[0023] Furthermore, in one embodiment of this utility model, the other end of the main shaft 1 is connected to a speed increaser; the speed increaser increases the rotational speed of the main shaft 1 through gear transmission, so that the impeller 2 obtains a higher rotational speed.

[0024] Working principle: Align the protrusion 11 on the end face of the main shaft 1 with the groove 22 on the end face of the impeller 2 body, allowing the protrusion 11 to slowly embed into the groove 22, completing the initial fit of the circumferential torque transmission structure; insert the connecting bolt 3 into the pre-set through holes of the main shaft 1 and the impeller 2 body, applying axial tension through the connecting bolt 3 to ensure a tight fit between the impeller 2 body and the end face of the main shaft 1, using the tension of the connecting bolt 3 to enhance the contact pressure between the protrusion 11 and the groove 22, improving torque transmission efficiency; at the front end of the impeller 2 body, tighten the locking nut 4 onto the end of the connecting bolt 3 to axially limit and fix the impeller 2 body, preventing the impeller 2 from malfunctioning during operation. Axial movement ensures the overall stability of the connection structure. During operation, the protrusion 11 and groove 22 stably transmit torque through lateral contact, while the axial connecting bolt 3 and locking nut 4 ensure axial fixation. Due to the large contact area and balanced force, it can effectively resist sudden loads caused by airflow impact and load changes, reducing the risk of failure. When it is necessary to repair or replace the impeller 2, first loosen the locking nut 4 and rotate the connecting bolt 3 counterclockwise to easily separate the impeller 2 body from the main shaft 1. If it is necessary to repair or replace the protrusion 11 and groove 22, the end face structure can be repaired by conventional machining methods and then reassembled, which is simple and efficient.

[0025] In summary, the assembled impeller 2, through the engagement of the protrusions 11 and grooves 22, has a large contact area, which can effectively disperse torque and reduce local stress concentration. The symmetrically distributed protrusions 11 make the force more balanced, avoiding local failures caused by structural deviations, and is suitable for high-speed rotation and high-torque transmission scenarios. The mechanical engagement of the protrusions 11 and grooves 22, combined with the preload of the axial connecting bolts 3, makes the connection structure less prone to micro-slippage under sudden loads, significantly reducing the risk of keyway plastic deformation and ensuring the stability of power transmission and equipment reliability. During assembly, the alignment of the protrusions 11 and grooves 22 is less difficult than that of traditional keyways. Disassembly only requires loosening the locking nut 4 and pulling out the connecting bolts 3 to separate the impeller 2 from the main shaft 1, without the need for complex keyway repair or replacement operations, greatly shortening maintenance time and costs.

[0026] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0027] 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 alterations 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. An assembly impeller, comprising an impeller and a main shaft, wherein the impeller and the main shaft are detachably connected, characterized in that: The main shaft end face is machined with at least two symmetrically distributed protrusions; the impeller body end face is provided with a groove that matches the protrusions, and the torque is transmitted through the side contact between the protrusions and the groove.

2. The impeller assembly according to claim 1, characterized in that: A bolt groove is provided between the impeller and the main shaft, and a connecting bolt is installed in the bolt groove. The connecting bolt passes through the main shaft and the impeller, and the impeller body and the main shaft are assembled and fitted together by axial tension.

3. An assembled impeller according to claim 2, characterized in that: The impeller and the connecting bolt are fixedly connected by a lock nut.

4. An assembled impeller according to claim 1, characterized in that: The protruding teeth are rectangular in structure, and there are two of them, symmetrically distributed on the end face of the main shaft.

5. An assembled impeller according to claim 1, characterized in that: A guide cone is provided at the front end of the impeller.

6. An assembled impeller according to claim 1, characterized in that: The guide cone is curved and smoothly connects to the curved surface of the impeller.

7. An assembled impeller according to claim 1, characterized in that: The other end of the main shaft is connected to a speed increaser.

Images