A sealing structure for a ship propeller

Abstract

The utility model discloses a kind of sealing structure for ship propeller, including propeller, flange bolt, flange pin, flange coupling, paddle shaft and sealing shell, propeller is fixedly connected in the one end of flange coupling by flange bolt and flange pin, the other end of flange coupling is connected with paddle shaft by taper cooperation, the outer circle of flange coupling is connected with sealing shell, and thus, two directions consistent water seal and two directions opposite oil seal are set inside sealing shell to form sealed oil cavity, realizes the double sealing effect of structure integration and sealing layered protection, wherein labyrinth structure prolongs leakage path, weakens fluid pressure difference drive, water-oil seal respectively blocks external water pressure and internal oil pressure, thus effectively solve the problems of difficult installation, large space, high leakage risk and short service life etc. caused by sealing structure split setting, complex path and sealing fatigue in prior art.

Description

Technical Field

[0001] This utility model relates to the field of propeller technology, specifically a sealing structure for ship propellers. Background Technology

[0002] In marine propulsion systems, propellers are typically connected to the propeller shaft via couplings. A sealing structure is also required at the coupling to prevent water from entering the transmission system. Traditionally, propellers are often connected to the coupling using a single type of screw, and the coupling and propeller shaft are typically connected using a key or spline connection. This process is complex, lacks precision in axial concentricity control, and can easily lead to polarization, vibration, and loosening issues during operation. Furthermore, to prevent water from seeping into the propeller shaft compartment, existing technologies generally employ independent sealing sleeves or bushings, adding an intermediate link between the coupling and the sealing device to achieve a partitioned arrangement of multiple water and oil seals. However, this structure not only has a long sealing path and many components, making assembly cumbersome, but also makes the sealing contact surfaces susceptible to wear, posing a risk of leakage and resulting in high maintenance costs.

[0003] The main problems with this type of structure are as follows: First, the connection structure between the propeller and the coupling has a single fixing method, which is insufficient in torsional strength and reliability, and is prone to loosening or difficulty in disassembly and assembly. Second, the coupling and the sealing structure are independent and separately set, which not only leads to a long structure and high installation space requirements, but also requires additional support transition parts for the sealing contact parts, increasing the number of parts and friction interface, reducing the seal life and overall reliability. Especially under high-speed rotation conditions, it is difficult to effectively ensure the concentricity of the outer surface of the coupling and the sealing components, which can easily lead to safety hazards such as shaft seal wear and oil and water leakage. It is difficult to meet the integrated development requirements of modern ships for efficient, compact and reliable propulsion devices.

[0004] Therefore, this utility model provides a sealing structure for ship propellers. Utility Model Content

[0005] In view of the shortcomings of the existing technology, this utility model provides a sealing structure for ship propellers to solve the above problems.

[0006] To achieve the above objectives, this utility model is implemented through the following technical solution: a sealing structure for a ship propeller, comprising a propeller, flange bolts, flange pins, a flange coupling, a propeller shaft, and a sealing housing. The propeller is fixedly connected to one end of the flange coupling by the flange bolts and flange pins. The other end of the flange coupling is connected to the propeller shaft by a tapered fit. The outer circle of the flange coupling is connected to the sealing housing.

[0007] Preferably, the flange coupling is made of stainless steel, the surface of which has been hardened, and it is used as a sealing working surface that cooperates with the sealing structure.

[0008] Preferably, the sealed housing is provided with at least two water seals and two oil seals.

[0009] Preferably, the two water seals are installed in the same direction, and the two oil seals are installed in opposite directions, i.e., their lips are set opposite each other.

[0010] Preferably, the flange coupling has a boss on its outer side, and the inner wall of the sealing housing has a groove that matches it. The boss and the groove fit together to form a labyrinth structure.

[0011] Beneficial effects

[0012] Compared with the prior art, the present invention has the following advantages:

[0013] (1) This utility model achieves high-strength mechanical fixing of the propeller and the coupling through the combined connection structure of the propeller, flange bolts and flange pins and flange coupling. The propeller provides axial fastening force through bolts and shear positioning through pins. In addition, the tapered interference fit structure between the flange coupling and the propeller shaft ensures that the entire power transmission chain maintains stable connection and precise coaxiality under high-speed rotation and complex load conditions. This solves the problems of increased vibration, structural failure and difficulty in disassembly and assembly caused by loose connection, installation eccentricity or stress concentration in traditional propeller connection structures.

[0014] (2) This utility model uses a flange coupling as the sealing working surface to directly cooperate with the sealing shell, and sets a boss on its outer circle to fit into the groove inside the shell to form a labyrinth structure. At the same time, two water seals in the same direction and two oil seals in opposite directions are set inside the sealing shell to form a sealing oil cavity, realizing the dual sealing effect of structural integration and layered sealing protection. The labyrinth structure extends the leakage path and weakens the fluid pressure difference drive, while the oil and water seals block the external water pressure and internal oil pressure respectively. This effectively solves the problems of difficult installation, large space, high leakage risk and short life caused by the separate setting of the sealing structure, complex path and sealing fatigue in the prior art. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] In the diagram: 1. Propeller; 4. Propeller shaft; 5. Flange bolt; 6. Flange pin; 7. Flange coupling; 9. Sealing housing; 10. Water seal; 11. Oil seal. Detailed Implementation

[0017] 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.

[0018] Please see Figure 1 A sealing structure for a ship propeller includes a propeller 1, flange bolts 5, flange pins 6, flange coupling 7, propeller shaft 4, and sealing housing 9. The propeller 1 is fixedly connected to one end of the flange coupling 7 by the flange bolts 5 and flange pins 6. The other end of the flange coupling 7 is connected to the propeller shaft 4 by a tapered fit. The outer circle of the flange coupling 7 is connected to the sealing housing 9 by a fit.

[0019] It should be noted that, in order to enhance the connection strength and torsional resistance between the propeller 1 and the coupling, the technical solution described in this embodiment adopts a combination of bolts and pins for connection. This ensures that the propeller 1 can maintain a reliable mechanical connection under high-speed rotation and complex load conditions, avoiding loosening or shear failure of a single connection. In addition, the coupling and the propeller shaft 4 adopt a tapered interference fit, which not only effectively ensures concentricity and power transmission efficiency, but also facilitates disassembly and maintenance. The outer circle of the coupling directly mates with the sealing housing 9, which simplifies the structural hierarchy of traditional split sealing components, reduces the shaft length, and improves structural integration and space utilization.

[0020] Furthermore, such as Figure 1 As shown, the flange coupling 7 is made of stainless steel with a hardened surface and is used as a sealing working surface to cooperate with the sealing structure.

[0021] It should be noted that, in order to improve the wear resistance and corrosion resistance of the sealing area, the flange coupling 7 is made of stainless steel with excellent corrosion resistance, and its surface is hardened by processes such as high-frequency quenching and nitriding. This ensures that the surface accuracy is maintained during long-term contact with the water seal 10 or oil seal 11, reduces the wear rate of the sealing lip, extends the life of the sealing system, avoids the risk of leakage caused by material failure, and further ensures the reliability and maintenance cycle of the propeller 1 system.

[0022] Furthermore, such as Figure 1 As shown, the sealed housing 9 is provided with at least two water seals 10 and two oil seals 11.

[0023] It should be noted that the sealing housing 9 described in this embodiment is provided with multiple sealing structures. The two water seals 10 arranged in series effectively block the infiltration of external water, forming a front-end water barrier. The two oil seals 11 are located on the inner side to prevent lubricating oil from leaking outward and to protect the shaft system from water vapor corrosion, thereby forming a two-way oil-water sealing defense line, which significantly enhances the sealing safety redundancy of the system and maintains sealing stability during long-term ship voyages or under high pressure differential environments.

[0024] Furthermore, such as Figure 1 As shown, the two water seals 10 are installed in the same direction, and the two oil seals 11 are installed in opposite directions, that is, their lips are set opposite each other.

[0025] It should be noted that the design described in this embodiment optimizes the sealing installation direction, with the two water seals 10 installed in the same direction, enhancing the stepped blocking ability against external water pressure; while the two oil seals 11 are arranged in opposite directions with their lips facing each other, forming a sealing oil cavity in the middle, which can be connected to the gravity oil tank through the layout of oil circuits to maintain a positive pressure environment between the sealing lips, thereby preventing problems such as lip lifting and negative pressure water absorption, and improving the sealing durability and dynamic sealing performance of the shaft system during operation.

[0026] Furthermore, such as Figure 1 As shown, the flange coupling 7 has a boss on its outer side, and the inner wall of the sealing housing 9 has a groove that matches it. The boss and the groove fit together to form a labyrinth structure.

[0027] It should be noted that, in order to further strengthen the sealing barrier, the solution described in this embodiment adds an annular boss to the outside of the flange coupling 7 and opens a matching groove at the corresponding position of the sealing housing 9. The two fit together to form a labyrinth structure, which effectively extends the leakage path, disrupts the liquid passage, and reduces the pressure differential driving force, making it difficult for liquid or particles to penetrate the sealing contact area. At the same time, it can avoid the sealing lip from directly bearing the fluid impact, effectively improving the system's leak-proof capability and anti-pollution capability. It is suitable for the sealing scenario of ship propeller 1 with high speed and high reliability requirements.

[0028] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0029] Working principle: Through the coordinated operation of the propeller 1, flange bolts 5, flange pins 6, flange coupling 7, propeller shaft 4, sealing housing 9, water seal 10, and oil seal 11, the propeller 1 system achieves high-strength installation and high-reliability sealing. The propeller 1 is reliably fixed to one end of the flange coupling 7 by the flange bolts 5 and flange pins 6, significantly improving the shear and torsional strength of the connection and preventing loosening or structural damage caused by high-speed rotation or impact loads. The other end of the flange coupling 7 is connected to the propeller shaft 4 through a tapered interference fit, which not only improves the coaxial accuracy of power transmission but also facilitates assembly, disassembly, and subsequent maintenance. The outer circle of the flange coupling 7 directly serves as the sealing working surface and connects with the sealing housing 9, eliminating the need for an additional transition bushing in the sealing structure, simplifying the shaft system hierarchy, reducing assembly complexity, and improving space integration efficiency. The sealing housing 9 is equipped with two water seals 10 and two oil seals 11. The water seals 10 are installed in the same direction to form a step-by-step water barrier. The lips of the oil seals 11 are arranged opposite each other to form a sealing oil cavity and can be connected to the gravity oil tank, forming a two-way sealing defense line. This effectively improves the sealing durability and failure resistance of the system under the interaction of seawater high pressure and internal oil pressure. In addition, the flange coupling 7 is provided with a boss structure on the outside, which fits into the groove on the inner wall of the sealing housing 9 to form a labyrinth structure to extend the leakage path and disrupt the fluid channel. Thus, a composite working mechanism of "high-strength connection + integrated sealing + labyrinth buffer" is constructed in the overall structure. This effectively solves the problems of poor structural adaptability, low connection stability, cumbersome sealing path and high leakage risk in traditional devices, and significantly improves the operational reliability, sealing life and system maintenance efficiency of the ship propulsion system in complex marine environments.

[0030] 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 process, method, article, or apparatus.

[0031] 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. A sealing structure for a ship propeller, characterized in that, The assembly includes a propeller (1), flange bolts (5), flange pins (6), flange coupling (7), propeller shaft (4), and sealing housing (9). The propeller (1) is fixedly connected to one end of the flange coupling (7) by the flange bolts (5) and flange pins (6). The other end of the flange coupling (7) is connected to the propeller shaft (4) by a tapered fit. The outer circle of the flange coupling (7) is connected to the sealing housing (9) in a fit.

2. The sealing structure for a ship propeller according to claim 1, characterized in that, The flange coupling (7) is made of stainless steel, with a hardened surface, and is used as a sealing working surface to cooperate with the sealing structure.

3. The sealing structure for a ship propeller according to claim 1, characterized in that, The sealed housing (9) is provided with at least two water seals (10) and two oil seals (11).

4. The sealing structure for a ship propeller according to claim 3, characterized in that, The two water seals (10) are installed in the same direction, and the two oil seals (11) are installed in opposite directions, that is, their lips are set opposite each other.

5. The sealing structure for a ship propeller according to claim 1, characterized in that, The flange coupling (7) has a boss on its outer side, and the inner wall of the sealing housing (9) has a groove that matches it. The boss and the groove fit together to form a labyrinth structure.

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