A protective propeller tail shaft sealing device

Abstract

This utility model provides a propeller tail shaft sealing device with protective function, installed on the propeller main shaft, including a rotating end and a fixed end. A dynamic sealing mechanism, sleeved on the propeller main shaft, is provided on both the rotating end and the fixed end. A protective mechanism is provided around the dynamic sealing mechanism, including a protective cover and a collecting ring. The protective cover is located at the fixed end and surrounds the rotating end to form a protective cavity. The collecting ring and the dynamic sealing mechanism are installed in the protective cavity. By using the protective mechanism to provide effective protection outside the dynamic sealing mechanism, it prevents entanglement from wrapping around the outer circumference of the tail shaft, reduces the rotational resistance of the tail shaft, improves the working environment of the dynamic sealing mechanism, and prevents entanglement from intruding into the dynamic sealing mechanism, thus preventing seal failure.

Description

Technical Field

[0001] This utility model relates to the field of marine power plant protection technology, and in particular to a propeller tail shaft sealing device with protective function. Background Technology

[0002] The propeller tail shaft is located at the very stern of the vessel and is responsible for transmitting power from the main engine to the propeller. The tail shaft seal is a crucial component of the tail shaft assembly; its function is to isolate seawater from the tail shaft's lubrication chamber, preventing external seawater from seeping into the hull and avoiding internal lubricant leakage. During long-term offshore operations, the propeller tail shaft often becomes entangled in fishing nets or other debris. When this happens, the propeller tail shaft's rotational resistance increases, and the entangled debris may enter the tail shaft seal, easily damaging the seal and causing it to fail. Utility Model Content

[0003] The technical problem to be solved by this utility model is that: when the existing tail shaft is in operation, the entanglement of material can easily cause an increase in the movement resistance of the tail shaft and damage the tail shaft sealing device. This utility model provides a propeller tail shaft sealing device with protective function to solve the above problems.

[0004] The technical solution adopted by this utility model to solve its technical problem is: a propeller tail shaft sealing device with protective function, installed on the propeller main shaft, including a rotating end and a fixed end, wherein a dynamic sealing mechanism is provided on the rotating end and the fixed end and sleeved on the propeller main shaft, and a protective mechanism is provided on the outer periphery of the dynamic sealing mechanism, wherein the protective mechanism includes a protective cover and a collecting ring, the protective cover is provided on the fixed end and surrounds the rotating end to form a protective cavity, and the collecting ring and the dynamic sealing mechanism are installed in the protective cavity.

[0005] The collecting ring is a hollow I-shaped structure with an installation section, a transition section and a backflow section. The backflow section is inclined toward the rotating end, and the installation section is fixedly installed on the end face of the rotating end. The collecting ring is located on the outer periphery of the dynamic sealing mechanism.

[0006] Furthermore: the dynamic sealing mechanism includes a sealing bushing, a sealing housing fitted on the sealing bushing, and a dynamic sealing ring installed between the sealing housing and the sealing bushing; the sealing bushing is fixedly installed on the outer periphery of the propeller main shaft, and the sealing housing is fixedly and sealed on the end face of the fixed end by a sealing gasket.

[0007] Furthermore: the protective cover is a split structure formed by splicing the two parts together, and the protective cover is provided with flow holes, axial stationary blades and radial stationary blades; the mounting section is provided with moving blades.

[0008] Furthermore: the sealing housing is composed of several sub-housings spliced ​​together along the axial direction, forming a sealing groove between adjacent sub-housings, and the dynamic sealing ring is installed in the sealing groove; the lip of the dynamic sealing ring near the fixed end is set towards the fixed end; the lip of the dynamic sealing ring near the rotating end is set towards the rotating end.

[0009] Furthermore, a sliding bearing and a cup seal are provided between the fixed end and the propeller main shaft.

[0010] The beneficial effects of this utility model are that the propeller tail shaft sealing device with protective function forms effective protection outside the dynamic sealing mechanism by adopting a protective mechanism, which prevents the winding material from wrapping around the outer circumference of the tail shaft, reduces the rotational resistance of the tail shaft, improves the working environment of the dynamic sealing mechanism, and prevents the winding material from invading the dynamic sealing mechanism and causing the seal failure. Attached Figure Description

[0011] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0012] Figure 1 This is a schematic diagram of the structure of a propeller tail shaft sealing device with protective function according to this utility model;

[0013] Figure 2 yes Figure 1 AA shows the structural sectional view;

[0014] Figure 3 yes Figure 1 The right view of the dynamic sealing mechanism is omitted.

[0015] Figure 4 This is a schematic diagram of the collection ring structure.

[0016] In the diagram: 1. Propeller main shaft; 2. Rotating end; 3. Fixed end; 4. Dynamic sealing mechanism; 5. Protective cover; 6. Collecting ring; 7. Protective cavity; 8. Mounting section; 9. Transition section; 10. Backflow section; 11. Sealing bushing; 12. Sealing housing; 13. Dynamic sealing ring; 14. Sealing gasket; 15. Flow passage; 16. Axial stationary blade; 17. Radial stationary blade; 18. Dynamic blade. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model. Rather, the embodiments of this utility model include all variations, modifications, and equivalents falling within the spirit and scope of the appended claims.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0019] Furthermore, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances. Furthermore, in the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0020] Any process or method described in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing a particular logical function or process, and the scope of the preferred embodiments of the present invention includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order according to the functions involved, as should be understood by those skilled in the art to which embodiments of the present invention pertain.

[0021] like Figures 1 to 4As shown, this utility model provides a propeller tail shaft sealing device with protective function, which is installed on the propeller main shaft 1 and includes a rotating end 2 and a fixed end 3. A dynamic sealing mechanism 4 is provided on the rotating end 2 and the fixed end 3, which is sleeved on the propeller main shaft 1. A protective mechanism is provided on the outer periphery of the dynamic sealing mechanism 4. The protective mechanism includes a protective cover 5 and a collecting ring 6. The protective cover 5 is disposed on the fixed end 3 and surrounds the rotating end 2 to form a protective cavity 7. The collecting ring 6 and the dynamic sealing mechanism 4 are installed in the protective cavity 7.

[0022] The collecting ring 6 is a hollow I-shaped structure with an installation section 8, a transition section 9 and a backflow section 10. The backflow section 10 is inclined toward the rotating end 2, and the installation section 8 is fixedly installed on the end face of the rotating end 2. The collecting ring 6 is located on the outer periphery of the dynamic sealing mechanism 4.

[0023] The propeller tail shaft sealing device of this patent is installed at the propeller tail shaft, forming three layers of protection. The first layer consists of a protective cover 5 and a rotating end 2. A small gap is formed between the protective cover 5 and the rotating end 2, which together form a protective cavity 7, which can mainly prevent most of the entangled objects from entering, and plays the most important protective function against external entangled objects.

[0024] The collecting ring 6 serves as the second layer of protection. Driven by the rotation of the propeller shaft 1, the collecting ring 6 rotates. The structure of the reverse flow section 10 of the rotating collecting ring 6, which is inclined towards the rotating end 2, will form a reverse water flow, preventing small entangled objects from moving inward.

[0025] The third layer of protection is the dynamic sealing mechanism 4, which acts as a dynamic seal for the stern shaft, effectively isolating the external seawater environment from the lubrication chamber and the interior of the hull where the stern shaft is installed. The dynamic sealing mechanism 4 is responsible for sealing and isolating the external environment from the interior of the stern shaft installation, and it is the part with the highest reliability requirements. The first and second layers of protection also prevent external debris from entering the sealing surface, avoiding abnormal wear, ensuring reliable sealing, and extending the lifespan of the propeller stern shaft sealing device.

[0026] The dynamic sealing mechanism 4 includes a sealing bushing 11, a sealing housing 12 fitted on the sealing bushing 11, and a dynamic sealing ring 13 installed between the sealing housing 12 and the sealing bushing 11; the sealing bushing 11 is fixedly installed on the outer periphery of the propeller main shaft 1, and the sealing housing 12 is fixedly and sealed on the end face of the fixed end 3 by a sealing gasket 14.

[0027] In the dynamic sealing mechanism 4, the external seawater and internal lubrication between the dynamic sealing ring 13 on the sealing housing 12 and the sealing sleeve 11 are effectively isolated by the sealing surface. Simultaneously, the sealing sleeve 11 rotates under the drive of the tail shaft, and the dynamic sealing ring 13 adheres tightly to the surface of the sealing sleeve 11, forming a continuous contact seal. This contact sealing method is stable and reliable; however, due to its contact nature, it is highly sensitive to media contamination. When impurities are introduced between the contacting sealing surfaces, it will significantly accelerate the wear of the sealing ring, leading to sealing leakage.

[0028] The first and second layers of protection in this application's technical solution prevent any entanglement material in the seawater from entering the contact surface of the dynamic seal, improve the operating environment of the dynamic seal mechanism 4, extend the seal life, and avoid abnormal leakage failures.

[0029] The protective cover 5 is a split structure formed by splicing two parts. The protective cover 5 is provided with a flow hole 15, an axial stationary blade 16, and a radial stationary blade 17; the mounting section 8 is provided with a moving blade 18. The axial stationary blade 16 and the radial stationary blade 17 have a cutting function, which can prevent fishing nets, ropes, cables, garbage, and other thin fibrous materials from becoming entangled around the outer periphery of the protective cover 5, thus providing initial protection. The flow hole 15 on the protective cover 5 is mainly used to guide the backflow of water from the collecting ring 6 out of the protective cavity 7 in a timely manner, preventing entangled materials from remaining in the protective cavity 7 for too long and reducing the risk of abnormal wear caused by the dynamic sealing surface.

[0030] The sealing housing 12 is composed of several sub-housings spliced ​​together along the axial direction, forming a sealing groove between adjacent sub-housings, and the dynamic sealing ring 13 is installed in the sealing groove; the lip of the dynamic sealing ring 13 near the fixed end 3 is set towards the fixed end 3; the lip of the dynamic sealing ring 13 near the rotating end 2 is set towards the rotating end 2.

[0031] The sealing housing 12 is assembled from sub-housing units and then axially tightened with bolts. This installation method improves assemblability because most of the dynamic sealing rings 13 have high hardness. The split assembly method facilitates the installation of the dynamic sealing rings 13 into the sealing housing 12 and also provides convenience for later disassembly and maintenance. The different orientations of the lips of the dynamic sealing rings 13 serve different sealing purposes. The sealing ring facing the rotating end 2 mainly seals against external moisture to prevent it from entering the lubrication chamber, while the sealing ring facing the fixed end 3 mainly seals against internal lubricating oil to prevent it from leaking to the outside.

[0032] A sliding bearing and a cup seal are provided between the fixed end 3 and the propeller main shaft 1. The sliding bearing and the cup seal serve as auxiliary seals.

[0033] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions of the terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0034] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A propeller tail shaft sealing device with protective function, installed on the propeller main shaft (1), comprising a rotating end (2) and a fixed end (3), characterized in that: The rotating end (2) and the fixed end (3) are provided with a dynamic sealing mechanism (4) that is sleeved on the propeller main shaft (1). A protective mechanism is provided on the outer periphery of the dynamic sealing mechanism (4). The protective mechanism includes a protective cover (5) and a collecting ring (6). The protective cover (5) is provided on the fixed end (3) and surrounds the rotating end (2) to form a protective cavity (7). The collecting ring (6) and the dynamic sealing mechanism (4) are installed in the protective cavity (7). The collecting ring (6) is a hollow I-shaped structure with an installation section (8), a transition section (9) and a backflow section (10). The backflow section (10) is inclined toward the rotating end (2), and the installation section (8) is fixedly installed on the end face of the rotating end (2). The collecting ring (6) is located on the outer periphery of the dynamic sealing mechanism (4).

2. The propeller tail shaft sealing device with protective function as described in claim 1, characterized in that: The dynamic sealing mechanism (4) includes a sealing bushing (11), a sealing housing (12) fitted on the sealing bushing (11), and a dynamic sealing ring (13) installed between the sealing housing (12) and the sealing bushing (11); the sealing bushing (11) is fixedly installed on the outer periphery of the propeller main shaft (1), and the sealing housing (12) is fixedly and sealed on the end face of the fixed end (3) by a sealing gasket (14).

3. A propeller tail shaft sealing device with protective function as described in claim 2, characterized in that: The protective cover (5) is a split structure formed by splicing. The protective cover (5) is provided with a flow hole (15), an axial stationary blade (16) and a radial stationary blade (17); the mounting section (8) is provided with a moving blade (18).

4. A propeller tail shaft sealing device with protective function as described in claim 3, characterized in that: The sealing housing (12) is composed of several sub-housings spliced ​​together along the axial direction, forming a sealing groove between adjacent sub-housings, and the dynamic sealing ring (13) is installed in the sealing groove; the lip of the dynamic sealing ring (13) near the fixed end (3) is set towards the fixed end (3); the lip of the dynamic sealing ring (13) near the rotating end (2) is set towards the rotating end (2).

5. A propeller tail shaft sealing device with protective function as described in claim 4, characterized in that: A sliding bearing and a rubber cup seal are provided between the fixed end (3) and the propeller main shaft (1).

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