Multi-chamber dynamic adjustment combined sealing device for pod thrusters

Abstract

The present invention belongs to the field of ship technology, and specifically relates to a multi-chamber dynamically adjustable combined sealing device for a pod thruster, the device comprising an end face sealing assembly, a packing and a skeleton seal; the end face sealing assembly comprises an end face sealing assembly static ring, an end face sealing assembly dynamic ring and an end face sealing tensioning ring, when the pod thruster is in use, the end face sealing assembly static ring and the end face sealing assembly dynamic ring rotate relatively at high speed to form a water film, so as to achieve an end face sealing effect; the packing is a coarse seal, which can prevent large particles from entering the end face sealing assembly and damaging the sealing joint surface; a grease injection hole is provided beside the skeleton seal, so as to effectively improve the working conditions of the skeleton seal and increase the service life of the skeleton oil seal; the present invention performs sealing by combining the packing, the end face sealing assembly and the skeleton seal lubricated with grease, so that the sealing device can adapt to the requirements of different drafts, especially the requirement of a pod thruster with a deeper draft, thereby greatly increasing the service life of the sealing device for the pod thruster.

Description

Technical Field

[0001] The invention belongs to the technical field of ships, and in particular relates to a multi-chamber dynamically adjustable combined sealing device for a pod thruster. Background Art

[0002] The traditional thruster sealing device is composed of 3 to 4 lip-shaped skeleton seals or cloth seals, which lack lubricating media, and the skeleton oil seal has a small allowable eccentricity, poor material wear resistance, and short sealing life; the cloth oil seal has low pressure resistance, and the pod thruster generally has a deep draft. The sealing ring is easy to deform in deep water, and the sealing performance is reduced, so it cannot be used in the pod thruster. The traditional thruster sealing device does not have leakage monitoring and drainage functions. Once a slight leakage occurs, a large amount of water will accumulate inside the pod over time. A large amount of water entering the pod thruster will directly cause the thruster to fail to work, the ship to lose power, and cause serious safety accidents. Summary of the invention

[0003] The present invention provides a multi-chamber dynamically adjustable combined sealing device for a pod thruster, aiming to solve the problems in the above-mentioned background technology of the skeleton oil seal of the traditional thruster sealing device, such as small allowable eccentricity, poor material wear resistance, short sealing life, reduced sealing performance and no leakage monitoring and drainage functions.

[0004] To achieve the above object, the present invention provides the following technical solutions:

[0005] A multi-chamber dynamically adjustable combined sealing device for a pod thruster comprises a sealing bushing, a sealing shell and an end face sealing assembly, wherein the sealing shell is fixedly connected to the pod body, and the sealing bushing is fixedly connected to the pod main shaft and rotates coaxially;

[0006] The sealing housing comprises a flange, a spacer, a first sealing base, a second sealing base and a third sealing base, wherein the flange, the spacer, the first sealing base, the second sealing base and the third sealing base are fixedly connected in sequence to form the sealing housing;

[0007] The end face sealing assembly comprises a static ring of the end face sealing assembly, a dynamic ring of the end face sealing assembly and an end face sealing tensioning ring. The static ring of the sealing assembly, the dynamic ring of the end face sealing assembly and the end face sealing tensioning ring are all arranged in the sealing housing. The static ring of the sealing assembly and the dynamic ring of the end face sealing assembly fit tightly.

[0008] Preferably, it further comprises a packing and a skeleton seal, wherein the packing is arranged on one side of the static ring of the sealing assembly, and the skeleton seal is arranged on the side of the sealing housing away from the end face sealing tension ring.

[0009] Preferably, it further comprises an integrated control box and a grease injection pipeline, a grease injection hole is opened on the side of the skeleton seal, and the integrated control box is fixedly connected to the grease injection hole through the grease injection pipeline.

[0010] Preferably, it also includes a monitoring and drainage pipeline, the sealing bushing, the flange, the spacer and the first sealing base form a closed sealed chamber, the sealing shell is provided with a drainage hole connected to the sealed chamber, one end of the monitoring and drainage pipeline is fixedly connected to the drainage hole, and the other end of the monitoring and drainage pipeline is fixedly connected to the integrated control box.

[0011] Preferably, the sealing bushing is fixedly connected to the pod main shaft via a clamping ring.

[0012] Preferably, the static ring of the sealing assembly and the dynamic ring of the end face sealing assembly are both made of wear-resistant materials.

[0013] Compared with the prior art, the present invention has the following beneficial effects:

[0014] The present invention uses a combination of packing, an end face sealing assembly made of highly wear-resistant materials and a grease-lubricated skeleton seal to perform sealing, so that the sealing device can adapt to the requirements of different drafts, especially the requirement of a pod propeller with a deeper draft, and greatly improves the service life of the sealing device for the pod propeller; when the pod propeller is in use, the static ring of the end face sealing assembly and the dynamic ring of the end face sealing assembly rotate relatively at high speed to form a water film, thereby achieving an end face sealing effect; the packing is a coarse seal, which can prevent large particles from entering the end face sealing assembly and damaging the sealing joint surface; a grease injection hole is provided next to the skeleton seal, which effectively improves the working conditions of the skeleton seal and increases the service life of the skeleton oil seal.

[0015] The drainage hole opened in the combined sealing device for the pod propeller of the present invention realizes the life cycle management of the pod sealing device through real-time monitoring of the displacement, thereby greatly improving the safety performance of the pod propeller and the entire ship. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a structural schematic diagram of the present invention;

[0017] In the figure: 1-nacelle main shaft, 2-sealing bushing, 3-flange, 4-spacer, 5-first sealing base, 6-second sealing base, 7-third sealing base, 8-packing, 9-end face sealing assembly static ring, 10-end face sealing assembly dynamic ring, 11-end face sealing tensioning ring, 12-skeleton seal, 13-integrated control box, 14-grease injection pipeline, 15-monitoring and drainage pipeline, 16-grease injection hole, 17-sealing chamber, 18-drainage hole, 19-clamping ring. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0019] See also Figure 1 The present invention provides a technical solution: a multi-chamber dynamically adjustable combined sealing device for a pod thruster, comprising a sealing bushing 2, a sealing shell and an end face sealing assembly, wherein the sealing shell is fixedly connected to the pod body, and the sealing bushing 2 is fixedly connected to the pod main shaft 1 and rotates coaxially;

[0020] The sealing housing comprises a flange 3, a spacer 4, a first sealing base 5, a second sealing base 6 and a third sealing base 7, and the flange 3, the spacer 4, the first sealing base 5, the second sealing base 6 and the third sealing base 7 are fixedly connected in sequence to form a sealing housing;

[0021] The end face sealing assembly includes an end face sealing assembly static ring 9, an end face sealing assembly dynamic ring 10 and an end face sealing tensioning ring 11. The sealing assembly static ring 9, the end face sealing assembly dynamic ring 10 and the end face sealing tensioning ring 11 are all arranged in a sealing housing, and the sealing assembly static ring 9 and the end face sealing assembly dynamic ring 10 fit tightly.

[0022] In this embodiment, a sealing shell is formed by fixing the flange 3, the spacer 4, the first sealing base 5, the second sealing base 6 and the third sealing base 7 in sequence, and the axial force is provided for a long time by the end face sealing tensioning ring 11, so that the static ring 9 of the end face sealing assembly and the dynamic ring 10 of the end face sealing assembly are always in a tightly fitted state. When the pod thruster is in use, the static ring 9 of the end face sealing assembly and the dynamic ring 10 of the end face sealing assembly rotate at high speed relative to each other to form a water film, thereby achieving an end face sealing effect.

[0023] Furthermore, it also includes a packing 8 and a skeleton seal 12. The packing 8 is arranged on one side of the static ring 9 of the sealing assembly, and the skeleton seal 12 is arranged on the side of the sealing housing away from the end face sealing tension ring 11.

[0024] In this embodiment, the sealing between the sealing housing and the sealing bushing 2 is achieved through the skeleton seal 12 and the packing 8. The packing 8 is a rough seal, and its main function is to prevent large particles from entering the end face sealing assembly and destroying the sealing joint surface between the static ring 9 and the dynamic ring 10 of the end face sealing assembly. The skeleton seal 12 is used when the end face sealing assembly fails.

[0025] Furthermore, it also includes an integrated control box 13 and a grease injection pipeline 14 . A grease injection hole 16 is opened on the side of the skeleton seal 12 . The integrated control box 13 is fixedly connected to the grease injection hole 16 through the grease injection pipeline 14 .

[0026] In this embodiment, grease can be injected through the grease injection holes 16 opened on the side of the skeleton seal 12, and the integrated control box 13 injects grease into the skeleton seal 12 in a regular and quantitative manner to increase the life of the skeleton seal 12.

[0027] Furthermore, it also includes a monitoring and drainage pipeline 15. The sealing bushing 2, the flange 3, the spacer 3 and the first sealing base 5 form a closed sealed chamber 17. A drainage hole 18 connected to the sealed chamber 17 is opened in the sealing shell. One end of the monitoring and drainage pipeline 15 is fixedly connected to the drainage hole 18, and the other end of the monitoring and drainage pipeline 15 is fixedly connected to the integrated control box 13.

[0028] In this embodiment, there is always pressurized air in the body of the pod thruster. The pressurized air enters the sealed chamber 17 from the back of the skeleton seal 12 through the skeleton seal 12 and the sealing bushing 2. A small amount of air will be brought into the seawater through the sealing joint surface of the static ring 9 of the end face sealing assembly and the dynamic ring 10 of the end face sealing assembly, so as to prevent the seawater from directly entering the sealed chamber 17 and improve the sealing ability of the end face sealing assembly. When a small amount of seawater enters the sealed chamber 17 through the end face sealing assembly, the pressurized air in the sealed chamber 17 assists the integrated control box 13 to move the seawater in the sealed chamber 17 along the drainage hole 18 into the monitoring and drainage pipeline 15, and then directly enters the leakage recovery monitoring water tank, so as to realize the monitoring and drainage functions of the leakage amount of the end face sealing assembly.

[0029] Furthermore, the sealing bushing 2 is fixedly connected to the nacelle main shaft 1 via a clamping ring.

[0030] In this embodiment, the sealing bushing 2 and the pod main shaft 1 are conveniently fixed by a clamping ring.

[0031] Furthermore, the static ring 9 of the sealing assembly and the dynamic ring 10 of the end face sealing assembly are both made of wear-resistant materials.

[0032] In this embodiment, the wear-resistant materials can be selected from graphite to silicon carbide, graphite to graphite, and silicon carbide to silicon carbide. Through end face sealing, the sealing service life of the static ring 9 of the sealing assembly and the dynamic ring 10 of the end face sealing assembly can be greatly improved. However, the wear-resistant materials are not limited to graphite and silicon carbide, and other good wear-resistant materials can also be selected.

[0033] The working principle and use process of the present invention: After the present invention is installed, the end face sealing tensioning ring 11 provides axial force for a long time, so that the static ring 9 of the end face sealing assembly and the dynamic ring 10 of the end face sealing assembly are always in a tightly fitted state. When the pod thruster is in use, the static ring 9 of the end face sealing assembly and the dynamic ring 10 of the end face sealing assembly rotate at high speed relative to each other to form a water film, thereby achieving an end face sealing effect. Sealing is performed by using a combination of packing 8, a high-wear-resistant material end face sealing assembly and a grease-lubricated skeleton seal 12, so that the sealing device can adapt to the requirements of different drafts.

[0034] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-chamber dynamically adjustable combined sealing device for a pod thruster, characterized in that: The device comprises a sealing bushing (2), a sealing shell and an end face sealing assembly, wherein the sealing shell is fixedly connected to the pod body, and the sealing bushing (2) is fixedly connected to the pod main shaft (1) and rotates coaxially; The sealing housing comprises a flange (3), a spacer (4), a first sealing base (5), a second sealing base (6) and a third sealing base (7) which are arranged in sequence and fixedly connected; The end face sealing assembly comprises an end face sealing assembly static ring (9), an end face sealing assembly dynamic ring (10) and an end face sealing tensioning ring (11); the sealing assembly static ring (9), the end face sealing assembly dynamic ring (10) and the end face sealing tensioning ring (11) are all arranged in the sealing housing; the sealing assembly static ring (9) and the end face sealing assembly dynamic ring (10) are tightly fitted; The device also includes a packing (8) and a skeleton seal (12), wherein the packing (8) is arranged on one side of the static ring (9) of the sealing assembly, and the skeleton seal (12) is arranged on a side of the sealing housing away from the end face sealing tension ring (11); The device further comprises an integrated control box (13) and a grease injection pipeline (14); a grease injection hole (16) is provided on the side of the skeleton seal (12); and the integrated control box (13) is fixedly connected to the grease injection hole (16) via the grease injection pipeline (14); The sealing bushing (2) is fixedly connected to the pod main shaft (1) via a clamping ring (19).

2. The multi-chamber dynamically adjustable combined sealing device for pod thrusters according to claim 1, characterized in that: The device also includes a monitoring and drainage pipeline (15), wherein the sealing bushing (2), the flange (3), the spacer (4) and the first sealing base (5) enclose a closed sealed chamber (17), and a drainage hole (18) connected to the sealed chamber (17) is provided in the sealed housing, one end of the monitoring and drainage pipeline (15) is fixedly connected to the drainage hole (18), and the other end of the monitoring and drainage pipeline (15) is fixedly connected to the integrated control box (13).

3. The multi-chamber dynamically adjustable combined sealing device for pod thrusters according to claim 1, characterized in that: The static ring (9) of the sealing assembly and the dynamic ring (10) of the end face sealing assembly are both made of wear-resistant materials.

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