Tail shaft bracket fairing, boat power device and boat

Abstract

The utility model discloses a stern shaft bracket fairing, a boat power device and a boat, the stern shaft bracket fairing comprises a main body, the middle part of the main body is provided with a through hole for a stern shaft to pass through, the outer diameter of the main body is gradually increased towards one side of a shaft hub of a stern shaft bracket, the side of the main body towards the shaft hub is provided with a bottom wall, the bottom wall is provided with a fixing hole, and the fixing hole is provided with a through hole. And the shaft sleeve is fixedly connected with the hub. Through the conical structure design that the outer diameter of the main body is gradually increased towards the shaft hub side, a gradually-changed guide surface can be formed in the fluid flowing direction, and the impact resistance between the front end of the shaft hub of the stern shaft bracket and a water body during sailing is remarkably reduced; moreover, the flow guide cover can be rigidly connected with the shaft hub through a mechanical fastener due to the arrangement of the bottom wall fixing hole, so that an integrated protection structure is formed, and the structural deformation and displacement risks generated under the navigation dynamic load are avoided; the three functions of resistance reduction, cavitation corrosion inhibition and foreign matter blocking are integrated on the whole, finally, the power transmission efficiency of the ship is improved, and the service life of the propeller and the service life of the bearing are prolonged.

Description

TECHNICAL FIELD

[0001] The utility model relates to the field of ship manufacturing technology, especially to a stern shaft support fairing, a ship power device with the stern shaft support fairing and a ship. BACKGROUND

[0002] In the field of modern ship manufacturing, the stern shaft support is usually designed to be outside the ship hull as a key component of the propulsion system, and its main function is to support the stern shaft and propeller to ensure their stable operation. However, this design brings a series of problems in the process of the ship's regular navigation.

[0003] Firstly, the shaft hub part of the stern shaft support is cylindrical, and when the ship advances in the water, this protruding structure will generate a large resistance in the water, which not only reduces the speed of the ship, but also increases fuel consumption, thereby affecting the overall performance and economy of the ship.

[0004] Secondly, the stern shaft support hub is prone to generate bubbles when advancing in the water, and these bubbles will cause cavitation corrosion to the propeller blades when the propeller rotates, which will significantly shorten the service life of the propeller and increase the maintenance cost.

[0005] In addition, the external stern shaft support hub is also prone to be hit by large foreign matter in the water during navigation, which may enter the bearing inside the stern shaft support, causing damage to the bearing and affecting the normal operation of the entire propulsion system. SUMMARY

[0006] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a stern shaft support fairing, which effectively reduces water resistance and bubble generation when the ship advances, improves navigation speed and prolongs the service life of the propeller, and also prevents foreign matter from entering the bearing, protects the safety of the bearing, reduces maintenance cost, and significantly improves the overall performance and economy of the ship.

[0007] The utility model also provides a ship power device with the above-mentioned stern shaft support fairing and a ship.

[0008] According to the stern shaft support fairing, comprising:

[0009] The main body has a through hole in the middle part for the stern shaft to pass through, and the outer diameter of the main body gradually increases towards one side of the shaft hub of the stern shaft support, and the main body has a bottom wall towards the shaft hub, and the bottom wall has a fixing hole for fixed connection with the shaft hub.

[0010] According to the present invention, a stern shaft support fairing has at least the following beneficial effects: Through the tapered structure design with the outer diameter of the main body gradually increasing towards the shaft hub, a gradual guiding surface can be formed along the fluid flow direction, significantly reducing the impact resistance between the front end of the stern shaft support hub and the water during navigation. Simultaneously, the design of a through-hole in the middle allows for either a large gap between the two to ensure the stern shaft can move freely inside the fairing without generating additional friction, or a clearance fit to ensure a stable connection between the stern shaft and the fairing. Furthermore, the bottom wall fixing holes allow the fairing to be rigidly connected to the shaft hub via mechanical fasteners, forming an integrated protective structure that avoids structural deformation and displacement risks under dynamic navigation loads. Overall, it achieves a triple integration of drag reduction, cavitation corrosion suppression, and foreign object isolation, ultimately improving the power transmission efficiency of the vessel and extending the service life of the propeller and bearings.

[0011] According to some embodiments of the present invention, a stern shaft bracket fairing is provided, wherein the maximum outer diameter of the main body is greater than or equal to the outer diameter of the shaft hub.

[0012] According to some embodiments of the present invention, a stern shaft frame fairing is provided, wherein the stern shaft is also connected to a propeller, the propeller is located on the side of the shaft hub away from the main body, the propeller is provided with a hub, and the outer diameter of the hub is less than or equal to the outer diameter of the shaft hub.

[0013] According to some embodiments of this utility model, a stern shaft bracket guide shield is provided, wherein the fixing hole is a threaded hole, and the main body and the shaft hub are fixed by screws located in the threaded hole.

[0014] According to some embodiments of this utility model, a stern shaft bracket guide cover is provided, wherein the fixing hole is a bolt gap hole for the bolt to pass through, and the outer wall of the main body is provided with a receiving groove, which can accommodate the nut fastened to the bolt.

[0015] According to some embodiments of this utility model, in a stern shaft bracket guide shield, after the nut and the bolt are tightened, the receiving groove is filled with sealant.

[0016] According to some embodiments of this utility model, a stern shaft bracket guide cover is provided in which the sealant, after solidification, smoothly transitions with the outer peripheral surface of the main body.

[0017] According to some embodiments of this utility model, a stern shaft bracket fairing is provided, wherein the main body is made of nylon, Teflon, or fiberglass.

[0018] The boat propulsion system according to this utility model includes a stern shaft bracket fairing as described in this utility model.

[0019] The boat propulsion device according to this utility model has at least the following beneficial effects: integrating the fairing into the boat propulsion device makes it an organic component of the propulsion system; by optimizing the dynamic parameter matching between the fairing and the stern shaft, hub, and propeller, the synergistic effect of the flow field design at the front end of the fairing and the pressure field of the propeller is achieved, reducing wake energy loss and suppressing resonance phenomena; at the same time, the foreign object isolation function of the fairing for the bearings reduces the downtime of the propulsion system due to failure, and improves the reliability and responsiveness of the boat in critical mission scenarios.

[0020] The boat according to this utility model includes a stern shaft bracket fairing as described in this utility model.

[0021] The vessel according to this utility model has at least the following beneficial effects: After applying the fairing to the vessel, combined with its functions of drag reduction, noise reduction and foreign object intrusion prevention, the overall navigation efficiency of the vessel is significantly improved, especially in high-speed cruising or under heavy load conditions, it can reduce fuel consumption by 10%-15%; the fairing's characteristic of reducing propeller cavitation noise also enhances the vessel's stealth, making it particularly suitable for the noise-sensitive applications of military vessels or scientific research vessels; in addition, the improved structural durability effectively reduces maintenance costs, providing technical support for the long-term economical operation of the vessel.

[0022] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0023] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0024] Figure 1 This is a schematic diagram of the structure of a stern shaft bracket fairing applied to a ship's power unit, according to an embodiment of the present invention.

[0025] Figure 2 This is a schematic diagram of the structure of a stern shaft frame fairing according to an embodiment of the present invention.

[0026] Explanation of icon numbers:

[0027] Body 100; Through hole 101; Fixing hole 102; Receiving groove 103; Sealant 1031; Bottom wall 110;

[0028] Stern shaft bracket 200; shaft hub 210;

[0029] Stern shaft 300; propeller 310; hub 311. Detailed Implementation

[0030] The embodiments of the present application are described below in detail, examples of the embodiments are shown in the drawings, wherein the same or similar notations represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary, only for explaining the present application, and cannot be understood as a limitation of the present application.

[0031] In the description of the present application, it should be understood that, in relation to the orientation description, for example, the orientation or position relationship indicated by up, down, front, back, left, right, etc. is based on the orientation or position relationship shown in the drawings, which is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply that the device or element indicated must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation of the present application.

[0032] In the description of the present application, the meaning of several is one or more, the meaning of multiple is more than two, greater than, less than, more than, etc. are understood as not including the number, above, below, etc. are understood as including the number. If it is described as first, second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features or the sequence of indicated technical features.

[0033] In the description of the present application, unless otherwise explicitly limited, the words such as setting, installing, connecting, etc. should be understood in a broad sense, and the person skilled in the art can reasonably determine the specific meaning of the above words in the present application in combination with the specific content of the technical scheme.

[0034] In the description of the present application, the description of the reference terms "one embodiment", "some embodiments", "illustrative embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in combination with the embodiment or example are included in at least one embodiment or example of the present application. In the specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the described specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0035] In the field of modern shipbuilding, the stern shaft support is usually designed to be outside the ship hull as a key component of the propulsion system, and its main function is to support the stern shaft and propeller to ensure their stable operation. However, this design brings a series of problems in the conventional navigation process of the ship.

[0036] Firstly, the shaft hub part of the stern shaft support is cylindrical, and when the ship advances in water, the protruding structure will generate a large resistance in water, which not only reduces the sailing speed of the ship, but also increases the fuel consumption, thereby affecting the overall performance and economy of the ship.

[0037] Secondly, the stern shaft support shaft hub is easy to generate air bubbles when advancing in water, and the air bubbles will cause cavitation corrosion to the propeller blades when the propeller rotates, which will significantly shorten the service life of the propeller and increase the maintenance cost.

[0038] In addition, the external stern shaft support shaft hub is also easy to be impacted by large foreign matters in water during sailing, and the foreign matters may enter the bearing in the stern shaft support, causing damage to the bearing and affecting the normal operation of the entire propulsion system.

[0039] Therefore, as shown in Figure 1 and Figure 2 , the utility model provides a stern shaft support fairing, which comprises a main body 100, wherein a through hole 101 for the stern shaft 300 to pass through is formed in the middle part of the main body 100, the outer diameter of the main body 100 gradually increases towards one side of the shaft hub 210 of the stern shaft support 200, and the side of the main body 100 towards the shaft hub 210 is provided with a bottom wall 110, and the bottom wall 110 is provided with a fixing hole 102 for fixed connection with the shaft hub 210. It should be noted that the taper structure design of the gradually increasing outer diameter of the main body 100 towards the shaft hub 210 side can form a gradually changing guide surface along the fluid flow direction, significantly reducing the impact resistance of the front end of the shaft hub 210 of the stern shaft support 200 and the water body during sailing, and through the design of the through hole 101 in the middle part, the stern shaft 300 can freely rotate inside the fairing without additional friction, or the stern shaft 300 and the fairing are stably connected through gap fitting; and the setting of the fixing hole 102 of the bottom wall 110 enables the fairing to be rigidly connected with the shaft hub 210 through mechanical fasteners to form an integrated protection structure, avoiding the risk of structural deformation and displacement under sailing dynamic load; the three functions of resistance reduction, cavitation corrosion inhibition and foreign matter blocking are integrated as a whole, finally improving the power transmission efficiency of the ship and prolonging the service life of the propeller 310 and the bearing.

[0040] Referring again to Figure 1In some embodiments of the utility model, the maximum outer diameter of the main body 100 is greater than or equal to the outer diameter of the shaft hub 210, ensuring that the flow guide cover can completely cover the front end of the shaft hub 210, eliminating the resistance peak caused by the direct exposure of the circular structure of the shaft hub 210 to the water flow. At the same time, the design of the size matching of the main body 100 and the shaft hub 210 can provide all-round physical protection for the front end of the shaft hub 210, preventing larger foreign matters such as fishing nets and floating objects from directly impacting or being stuck in the gap of the shaft hub 210, reducing the damage risk to the bearing inside the stern shaft support 200, and prolonging the maintenance cycle of the core components. Optionally, the maximum outer diameter of the main body 100 is equal to the outer diameter of the shaft hub 210, considering that the main body 100 is conical, that is, the outer diameter of the bottom wall 110 corresponding to one end of the main body 100 towards the shaft hub 210 is equal to the outer diameter of the shaft hub 210. Further, referring again to Figure 1 In some embodiments of the utility model, the propeller 310 is connected to the stern shaft 300, the propeller 310 is located on the side of the shaft hub 210 away from the main body 100, and the propeller 310 is provided with a hub 311, and the outer diameter of the hub 311 is less than or equal to the outer diameter of the shaft hub 210. The continuous streamline structure of the flow guide cover, the shaft hub 210 and the propeller 310 is formed by size specification constraints, avoiding the local water flow interruption phenomenon caused by the outer diameter of the hub 311 exceeding the outer diameter of the shaft hub 210, which can greatly reduce the impact of vortex and air bubbles caused by the rotation of the propeller 310 on the shaft hub 210. At the same time, the size matching of the hub 311 and the shaft hub 210 can optimize the rotation efficiency of the propeller 310, reduce the probability of cavitation corrosion caused by shafting vibration, and further improve the reliability of the ship propulsion system.

[0041] In some embodiments of the utility model, the fixing hole is a threaded hole, and the main body and the shaft hub are fixed by a screw located in the threaded hole (not shown in the figure), which can simplify the assembly process of the flow guide cover and the shaft hub, realize high-precision positioning and rigid connection through thread engagement, and avoid the bending deformation risk caused by the excessive length of the screw rod in the traditional bolt and nut connection. In addition, the one-way locking feature of the screw can also effectively disperse the shear force of the water flow on the flow guide cover, prevent the loosening or displacement of the connection part, especially suitable for the harsh requirements of structural stability under high-speed navigation conditions, and ensure the reliability of the long-term operation of the flow guide cover. In some embodiments of the utility model, as shown in Figure 1 and Figure 2As shown, the fixing hole 102 is a bolt clearance hole for the bolt to pass through, and the outer wall of the main body 100 is provided with a receiving groove 103 capable of accommodating the nut fastened with the bolt. In this regard, through the cooperative design of the bolt clearance hole and the receiving groove 103, the bolt is allowed to pass through the main body 100 vertically from the outside and be fastened with the nut, greatly improving the installation flexibility and maintainability. The depth of the receiving groove 103 is set such that the nut is completely embedded inside the main body 100, avoiding the damage to the streamlined outer surface of the fairing caused by the traditional outward protruding nut, and reducing the water flow separation and bubble generation caused by the local protrusion. In addition, this design is compatible with standard bolts and nuts of different specifications, reducing the dependence on customized parts and adapting to the diversified size requirements of the shaft hub 210. Further, after the nut is fastened with the bolt, the receiving groove 103 is filled with sealant 1031, and then the sealant 1031 is used to seal the small gap in the receiving groove 103 by virtue of its elasticity and adhesion, forming a double barrier against water and foreign matter, blocking the path of seawater penetrating into the contact surface of the shaft hub 210 through the bolt hole, and effectively inhibiting the corrosion and electrolysis reaction of seawater on the fastener. At the same time, the sealant 1031 forms a buffer layer after solidification, which can absorb the shock energy generated during the rocking of the ship or the idling of the propeller 310, reducing the risk of bolt fracture or thread wear, and prolonging the overall service life of the fairing. Further, the sealant 1031 smoothly transitions with the outer peripheral surface of the main body 100 after solidification. Through the cooperation of the colloid filling and surface grinding process, the geometric continuity of the outer surface of the fairing is ensured, and the local flow rate mutation phenomenon caused by the protrusion or depression of the sealant 1031 is eliminated, reducing the damage of cavitation to the fairing material. In addition, the smooth surface can also reduce the attachment probability of marine organisms such as barnacles and algae, avoiding the problem of increased parasitic resistance caused by the thickening of the biological membrane, and maintaining the long-term sailing efficiency of the ship.

[0042] Optionally, in some embodiments of the utility model, the main body 100 is made of nylon, Teflon or glass steel. Among them, the low friction coefficient characteristic of nylon can reduce the resistance power consumption when the propeller shaft 300 rotates at high speed, the excellent chemical inertness of Teflon can resist seawater salt spray corrosion and ultraviolet erosion, and the lightweight and high-strength characteristics of glass steel can give the fairing excellent fatigue resistance and impact resistance. In this regard, the comprehensive application of these materials does not require additional rust-proof coating, significantly reducing manufacturing and maintenance costs, while ensuring the long-term service stability of the fairing in harsh marine environments.

[0043] The ship power device according to the embodiment of the present application comprises a stern shaft support fairing according to the embodiment of the present application. The fairing is integrated into the ship power device, so as to become an organic component of the propulsion system. By optimizing the dynamic parameter matching of the fairing, the stern shaft 300, the shaft hub 210 and the propeller 310, the synergistic effect of the front end flow field design of the fairing and the pressure field of the propeller 310 is realized, the energy loss of the wake flow is reduced, and the resonance phenomenon is inhibited. At the same time, the foreign matter isolation function of the fairing reduces the fault downtime of the power system, and improves the reliability and response capability of the ship in the key task scene.

[0044] Other configurations and operations of the ship power device according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here.

[0045] The ship according to the embodiment of the present application comprises a stern shaft support fairing according to the embodiment of the present application. After applying the fairing in the ship, combined with the functions of drag reduction, noise reduction and foreign matter intrusion prevention, the overall navigation efficiency of the ship is significantly improved. Especially under the high-speed cruising or load working condition, the fuel consumption can be reduced by 10%-15%. The characteristic of the fairing reducing the cavitation noise of the propeller 310 also enhances the concealment of the ship, and is particularly suitable for the application requirements of military ships or scientific research ships sensitive to noise. In addition, the improvement of structural durability effectively reduces the operation and maintenance cost, and provides technical support for long-term economic operation of the ship.

[0046] Other configurations and operations of the ship according to the embodiment of the present application are known to those skilled in the art, and will not be described in detail here.

[0047] The embodiments of the present application are described in detail above in combination with the drawings, but the present application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present application.

Claims

1. A stern tube support fairing, characterized in that, Comprise: The main body has a through hole in the middle for the stern shaft to pass through, the outer diameter of the main body gradually increases towards the side of the shaft hub of the stern shaft support, the main body has a bottom wall towards the side of the shaft hub, the bottom wall has a fixing hole for fixed connection with the shaft hub.

2. A stern tube skeg nozzle according to claim 1, characterized in that: The maximum outer diameter of the main body is greater than or equal to the outer diameter of the shaft hub.

3. A stern tube boss fairing according to claim 1 or 2, characterized in that: The stern shaft is further connected with a propeller, the propeller is located on the side of the shaft hub away from the main body, the propeller is provided with a hub, the outer diameter of the hub is less than or equal to the outer diameter of the shaft hub.

4. A stern tube boss fairing according to claim 1, characterized in that: The fixing hole is a threaded hole, the main body and the shaft hub are fixed by a screw located in the threaded hole.

5. A stern tube boss fairing according to claim 1, characterized in that: The fixing hole is a bolt clearance hole for the bolt to pass through, the outer wall of the main body is provided with a receiving groove, the receiving groove can accommodate a nut fastened with the bolt.

6. A stern tube boss fairing according to claim 5, characterized in that: After the nut and the bolt are fastened, the receiving groove is filled with sealant.

7. A stern tube boss fairing according to claim 6, characterized in that: After the sealant solidifies, it smoothly transitions with the outer peripheral surface of the main body.

8. A stern tube boss fairing according to claim 1, characterized in that: The main body is made of nylon, Teflon or glass steel.

9. A marine power plant, characterised in that: A stern shaft support fairing comprising any one of claims 1-8.

10. A watercraft characterised by: A stern shaft support fairing comprising any one of claims 1-8.

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