Propeller hub sealing structure and device and ship

Abstract

The embodiment of the invention provides a propeller hub sealing structure and device and a ship, the structure comprises an inner gland, a shaft sleeve is sleeved with the inner gland, the inner gland is in clearance fit with the shaft sleeve and a propeller, and the end face, close to one side of the propeller, of the inner gland is watertight through a radial sealing ring; and the outer gland is sleeved on the shaft sleeve on the outer side of the inner gland and is in clearance fit with the shaft sleeve and the inner gland, and the inner ring side of the outer gland is close to the end position of the inner gland, so that the contact surfaces of the outer gland and the shaft sleeve as well as the outer gland and the inner gland are sealed through an axial sealing ring. According to the embodiment of the invention, a traditional sealing gland is optimized into a combined form of the inner gland and the outer gland, and the axial sealing ring and the radial sealing ring are mounted in two independent steps, so that the process is simplified, and the synchronous mounting difficulty is reduced; furthermore, the inspection hole is formed in the inner gland, so that the sealing effectiveness can be inspected under the condition that the gland is not disassembled, the daily maintenance is simple, and the safety effect is remarkable.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of ship structure design, in particular to a propeller boss sealing structure, device and ship. BACKGROUND

[0002] The outstanding advantage of water-lubricated shafting over oil-lubricated shafting is environmental protection, which completely eliminates the possibility of oil pollution of the ocean. However, for water-lubricated shafting applied to steel ships, special attention should be paid to the corrosion of seawater on forged steel parts, and the surface of the forged steel shaft must be effectively protected. The surface of the forged steel shaft should be ensured not to contact open seawater, because seawater has strong corrosive properties and will have adverse effects on the forged steel shaft, such as corrosion cracks and fatigue deepening. Therefore, various methods are used to protect the surface of the forged steel shaft in the design (such as shaft sleeve, epoxy coating protection, etc.). The propeller end face position is a special contact position, as shown in Figure 1 , the propeller boss and the forged steel shaft are installed by hydraulic push-in, and the boss and the sleeve cannot be sealed and fitted, so there must be an installation gap between the propeller and the sleeve. The installed propeller is in an open water environment, and if effective sealing measures are not taken at the end, seawater will enter the cavity gap between the propeller and the shaft, which will have very serious consequences and will endanger the safety of the ship.

[0003] The prior art generally adopts the following types:

[0004] 1. Type a, a push-in compression sealing ring is used, the sealing ring is axially compressed, the gap fitting surface between the sleeve and the gland is sealed, and the water tightness is achieved by the radial fastening screw and the gasket, as shown in Figure 2 ;

[0005] 2. Type b, an inclined compression sealing ring is used, the principle is similar, as shown in Figure 3 ;

[0006] The disadvantages of type a and type b are that the force variation of the propeller moving in water is not fully considered, and after a long time of operation, the deformation of the radial end face screw gasket sealing type may cause sealing failure;

[0007] 3. Type c, an axial and radial double sealing ring type is used, which can improve the working conditions of type a and type b, as shown in Figure 4 .

[0008] Therefore, the sealing gland of type c is a relatively popular method, which can be expected to achieve a long-term sealing effect, but its disadvantage is that

[0009] (1) the installation is relatively difficult, and the alignment installation needs to be completed in the axial and radial directions at the same time, which has a large process difficulty;

[0010] (2) The installation of the sealing ring requires high accuracy, and the sealing effect will be affected by over-tightening or over-loosening. After installation, it is difficult to check the actual sealing effect, and only the implementation process experience of the construction technology can be used to determine whether the predetermined requirements are met;

[0011] (3) The material of the sealing ring has a general service life, and the range of the service life is generally wide. For safety, regular inspection is required. After the sealing ring is used for a certain period of time, it is not possible to check and determine whether it is still effective. Only by disassembling can the sealing effect be checked and determined. Once the sealing ring is disassembled, it cannot be used by resetting, and it must be replaced.

[0012] (4) Frequent disassembly and inspection will increase the gap between the devices and reduce the fit, which is not conducive to achieving the sealing state again. SUMMARY

[0013] In view of the above problems existing in the prior art, the embodiments of the present application provide a propeller hub sealing structure, device and ship to solve the above technical problems existing in the prior art and achieve the purposes of convenient installation, controllable sealing effect and convenient inspection without disassembling the device.

[0014] The embodiments of the present application provide a propeller hub sealing structure, which comprises:

[0015] An inner gland cover is sleeved on the shaft sleeve and cooperates with the shaft sleeve and the propeller gap. A radial sealing groove is formed at the end face of the side close to the propeller, and a radial sealing ring is arranged in the radial sealing groove. The inner gland cover is fixed on the propeller by a fastening screw and realizes sealing between the contact surfaces of the inner gland cover and the propeller by compressing the radial sealing ring.

[0016] An outer gland cover is sleeved on the shaft sleeve outside the inner gland cover and cooperates with the shaft sleeve and the inner gland cover. An axial sealing groove is formed at the end position of the inner ring side close to the inner gland cover, and an axial sealing ring is arranged in the axial sealing groove. The outer gland cover is fixed on the inner gland cover by a fastening screw and realizes sealing between the contact surfaces of the outer gland cover and the shaft sleeve and the contact surfaces of the outer gland cover and the inner gland cover by compressing the axial sealing ring.

[0017] In an embodiment, the inner gland cover, the propeller and the shaft sleeve are further sealed by filling grease in the cavity after installation.

[0018] In an embodiment, an inspection hole is formed in the inner gland cover to communicate with the external space and the cavity after installation, and the inspection hole is water-tight by screwing a pipe with a threaded plug.

[0019] In an embodiment, the inner gland is provided with a groove at the ring side orifice of the inspection hole, the groove is communicated with the post-installation cavity, and the inner gland and the shaft sleeve gap can be increased.

[0020] In an embodiment, the inspection hole is provided with two groups.

[0021] In an embodiment, the two groups of inspection holes are arranged at the upper and lower ends of the inner gland.

[0022] In addition, the embodiment of the present application also provides a propeller hub sealing device, which comprises the inner gland and the outer gland according to any embodiment of the present application.

[0023] In addition, the embodiment of the present application also provides a ship, which is characterized in that the ship comprises the propeller hub sealing structure according to any embodiment of the present application.

[0024] Compared with the prior art, the propeller hub sealing structure, device and ship provided by the embodiment of the present application have the following beneficial effects:

[0025] 1. The traditional sealing gland is optimized to the combined form of the inner gland and the outer gland in the embodiment of the present application, and the axial sealing ring and the radial sealing ring are installed in two independent steps, so that the process is simplified and the difficulty of synchronous installation is reduced.

[0026] 2. The embodiment of the present application can check the sealing effectiveness without dismounting the gland by opening the inspection hole in the inner gland, so that the daily maintenance is simple and the safety effect is remarkable. BRIEF DESCRIPTION OF DRAWINGS

[0027] Figure 1 It is a schematic diagram of the assembly relationship between the propeller and the forged steel shaft related to the embodiment of the present application.

[0028] Figure 2 It is a structural schematic diagram of type a related to the background technology part of the present application.

[0029] Figure 3 It is a structural schematic diagram of type b related to the background technology part of the present application.

[0030] Figure 4 It is a structural schematic diagram of type c related to the background technology part of the present application.

[0031] Figure 5 It is a structural schematic diagram of the propeller hub sealing structure provided by the embodiment of the present application.

[0032] Figure 6 It is a front view structural schematic diagram of the inner gland related to the propeller hub sealing structure provided by the embodiment of the present application.

[0033] Figure 7 Fig. 1 is a structural schematic view of a propeller hub sealing structure according to an embodiment of the present application; Figure 6 Fig. 2 is a structural schematic view of a propeller hub sealing structure according to an embodiment of the present application;

[0034] Figure 8 Fig. 3 is a structural schematic view of a propeller hub sealing structure according to an embodiment of the present application; Figure 6 Fig. 4 is a structural schematic view of a propeller hub sealing structure according to an embodiment of the present application;

[0035] Figure 9 Fig. 5 is a structural schematic view of a pipe threaded plug involved in a propeller hub sealing structure according to an embodiment of the present application.

[0036] Reference signs:

[0037] 1. propeller; 2. shaft; 3. shaft sleeve; 4. inner gland; 5. radial sealing groove; 6. radial sealing ring; 7. first threaded hole; 8. second threaded hole; 9. groove; 10. rear cavity; 11. outer gland; 12. axial sealing groove; 13. axial sealing ring; 14. fastening screw 1; 15. fastening screw 2; 16. inspection hole; 17. pipe threaded plug. DETAILED DESCRIPTION

[0038] In order for those skilled in the art to better understand the technical solutions of the present application, the present application will be described in detail below in combination with the drawings and specific embodiments.

[0039] The various aspects and features of the present application are described herein with reference to the accompanying drawings.

[0040] These and other characteristics of the present application will become apparent from the following description of the preferred forms given, by way of non-limiting example, with reference to the annexed drawings.

[0041] It is also to be understood that even though numerous specific details of the present application are set out herein, various other equivalent forms of implementing the present application can be realized.

[0042] The above and other aspects, features and advantages of the present application will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings, in which:

[0043] Specific embodiments of the present application are described hereinafter with reference to the accompanying drawings; however, it is to be understood that the embodiments described are merely examples of the present application, which can be implemented in numerous ways. Well-known and / or repeated functions and structures are not described in detail since they would obscure the understanding of this application in accordance with the purpose of the specification. Therefore, the detailed description of specific structural and functional details set forth herein are not intended to limit the scope of the application but merely serve as representative examples of the application.

[0044] The specification can use the phrases "in one embodiment," "in another embodiment," "in yet another embodiment," or "in other embodiments," which can refer to one or more embodiments according to the application.

[0045] The principles and features of the present application are described in the following detailed description of the application, which is presented in conjunction with the accompanying drawings. The embodiments shown are only for the purpose of explanation and are not meant to limit the scope of the application. The following detailed description of the application is presented in conjunction with the accompanying drawings. Figures 1-9 The preferred embodiments of the present application are further described in detail:

[0046] Generally, the end face sealing cover of the design uses the O-shaped sealing ring to press or obliquely press to seal, which can theoretically achieve the expected sealing effect, but there are several problems: 1. The installation requirement of the sealing ring is relatively high, and the tightness or looseness will affect the sealing effect. The actual sealing effect after installation is difficult to check in the general design; 2. The material of the sealing ring has a general service life, and the range of the service life is generally wide. For safety, regular inspection is required. In the general design, the sealing effect can only be checked and judged by disassembling, and the sealing ring cannot be used continuously by resetting after being disassembled for a period of time. It must be replaced; 3. Frequent disassembly and inspection will cause the gap between the devices to increase, and the fit will decrease, which is not conducive to achieving the sealing state again and maintaining.

[0047] In order to solve the above technical problems, as shown in the drawings, Figures 1-9 The embodiment of the present application provides a propeller hub sealing structure, which comprises:

[0048] An inner pressure cover 4 is sleeved on the shaft sleeve 3 and gap-fitted with the shaft sleeve 3 and the propeller 1. A radial sealing groove 5 is formed at the end face of the side close to the propeller 1, and a radial sealing ring 6 is arranged in the radial sealing groove 5. The inner pressure cover 4 is tightly fixed on the propeller 1 by a fastening screw 1 4, and the sealing between the contact surface of the inner pressure cover 4 and the propeller 1 is realized by tightly pressing the radial sealing ring 6.

[0049] An outer pressure cover 1 1 is sleeved on the shaft sleeve 3 outside the inner pressure cover 4 and gap-fitted with the shaft sleeve 3 and the inner pressure cover 4. An axial sealing groove 1 2 is formed at the end position of the inner ring side close to the inner pressure cover 4, and an axial sealing ring 1 3 is arranged in the axial sealing groove 1 2. The outer pressure cover 1 1 is tightly fixed on the inner pressure cover 4 by a fastening screw 2 1 5, and the sealing between the contact surface of the outer pressure cover 1 1 and the shaft sleeve 3, and the contact surface of the outer pressure cover 1 1 and the inner pressure cover 4 is realized by obliquely pressing the axial sealing ring 1 3.

[0050] The inner pressure cover 4 is provided with a first threaded hole 7 for mounting a first fastening screw 14 and a second threaded hole 8 for mounting a second fastening screw 15, the first threaded hole 7 is a through hole, the second threaded hole 8 is a counterbore, and the first threaded hole 7 and the second threaded hole 8 are arranged in an annular array on the inner pressure cover 4.

[0051] The embodiment of the present application retains the design of the axial sealing ring 13 and the radial sealing ring 6, and can maximize the sealing effect under the running state of the ship. The sealing inner pressure cover 4 is mounted with the screw gasket on the end surface of the propeller 1 and is embedded in the radial sealing ring 6 to strengthen the long-term sealing effect. The sealing outer pressure cover 11 adopts the traditional inclined pressure sealing mode, is convenient to install, has good axial sealing effect, and is fastened and connected with the inner pressure cover 4 by using the screw gasket mounting mode. Since the axial sealing ring 13 and the radial sealing ring 6 are installed in two independent steps, the process is simplified and the difficulty of synchronous installation is reduced.

[0052] In an embodiment, the installation cavity 10 between the inner pressure cover 4, the propeller 1 and the shaft sleeve 3 is further sealed by filling grease, and the purpose of filling grease is to prevent external seawater from entering by blocking with pressurized grease, which is the last protection before seawater contacts the surface of the forged steel shaft 2.

[0053] In an embodiment, the inner pressure cover 4 is provided with an inspection hole 16 communicating with the outside space and the installation cavity 10, and the inspection hole 16 is water-tight by using a threaded pipe threaded plug 17.

[0054] In an embodiment, the inner pressure cover 4 is provided with a groove 9 at the annular side hole of the inspection hole 16, the groove 9 communicates with the installation cavity 10, and can realize the effect of increasing the gap between the inner pressure cover 4 and the shaft sleeve 3.

[0055] In an embodiment, the inspection hole 16 is provided with two groups.

[0056] Further, in an embodiment, the two groups of inspection holes 16 are arranged at the upper and lower ends of the inner pressure cover 4, respectively.

[0057] That is, the upper and lower ends of the sealing inner pressure cover 4 are respectively drilled to reach the installation cavity 10, and the threaded pipe threaded plug 17 is used to achieve water-tightness. The purpose of drilling has three aspects, one is that the upper hole can be used for filling grease after the first installation, the second is that the lower hole can be used for drainage during later inspection, and the third is that the upper and lower holes can be used for endoscopy, and even the possibility of installing a subsequent application such as a water immersion sensor can be considered. The inspection of the drainage plug, when internal seawater flows out, it means that the sealing ring has failed, at this time the sealing ring needs to be disassembled and the shafting needs to be further checked, when there is no seawater flowing out, it means that the sealing property of the device is good, if the sealing ring material is still within the effective period, it can avoid disassembly and replacement.

[0058] The inner gland 4, the outer gland 11 and the shaft sleeve 3 are gaps, facilitating actual site installation, and the gap should be increased at the position of the inspection hole 16 of the inner gland 4, facilitating the flow of grease injection and the insertion during the inspection of the endoscope sensor.

[0059] In addition, the embodiment of the present application further provides a propeller hub sealing device, which comprises the inner gland 4 and the outer gland 11 according to any one of the embodiments of the present application.

[0060] In addition, the embodiment of the present application further provides a ship, which comprises the propeller hub sealing structure according to any one of the embodiments of the present application.

[0061] The busy embodiment has the following beneficial effects:

[0062] 1. The part design is simple and convenient for manufacturing and processing;

[0063] 2. The installation process is simplified, and the installation difficulty is reduced;

[0064] 3. The routine maintenance is simple, and the safety effect is remarkable.

[0065] The above embodiments are only exemplary embodiments of the present application and are not used to limit the present application, and the protection scope of the present application is defined by the claims. Those skilled in the art can make various modifications or equivalent replacements to the present application within the spirit and protection scope of the present application, and such modifications or equivalent replacements should also be considered to fall within the protection scope of the present application.

Claims

1. A propeller hub sealing structure, characterized in that, include: An inner pressure cover (4) is fitted on the bushing (3) and has a clearance fit with the bushing (3) and the propeller (1). A radial sealing groove (5) is provided on the end face near the propeller (1), and a radial sealing ring (6) is provided in the radial sealing groove (5). The inner pressure cover (4) is pressed and fixed on the propeller (1) by a fastening screw (14), and the seal between the inner pressure cover (4) and the contact surface of the propeller (1) is achieved by pressing the radial sealing ring (6). An outer pressure cover (11) is fitted on the bushing (3) outside the inner pressure cover (4) and has a clearance fit with the bushing (3) and the inner pressure cover (4). An axial sealing groove (12) is provided on the inner ring side near the end of the inner pressure cover (4), and an axial sealing ring (13) is provided in the axial sealing groove (12). The outer pressure cover (11) is pressed and fixed on the inner pressure cover (4) by fastening screw two (15), and the sealing between the contact surfaces of the outer pressure cover (11) and the bushing (3) and the inner pressure cover (4) is achieved by obliquely pressing the axial sealing ring (13).

2. The propeller hub sealing structure according to claim 1, characterized in that: The cavity (10) between the inner pressure cover (4), propeller (1) and bushing (3) after installation is further sealed by filling with grease.

3. The propeller hub sealing structure according to claim 2, characterized in that: The inner pressure cover (4) is provided with an inspection hole (16) that connects the external space and the cavity (10) after installation, and the inspection hole (16) is watertight by means of a threaded plug (17) on a threaded pipe.

4. The propeller hub sealing structure according to claim 3, characterized in that: The inner pressure cover (4) has a groove (9) at the inner ring side opening of the inspection hole (16). The groove (9) communicates with the cavity (10) after installation and can increase the gap between the inner pressure cover (4) and the bushing (3).

5. The propeller hub sealing structure according to claim 3, characterized in that: The inspection hole (16) is provided in two sets.

6. The propeller hub sealing structure according to claim 5, characterized in that: Two sets of inspection holes (16) are respectively located at the upper and lower ends of the inner pressure cover (4).

7. A propeller hub sealing device, characterized in that: The device includes an inner pressure cover (4) and an outer pressure cover (11) as described in any one of claims 1-6.

8. A ship, characterized in that: The vessel includes a propeller hub sealing structure as described in any one of claims 1-6.

Images