Sealing system for lateral propeller

Abstract

The utility model relates to the technical field of propeller sealing, and discloses a sealing system for a lateral propeller, which comprises a propeller main body, a gravity oil tank and a sealing mechanism, a driving shaft and a propeller shaft are arranged on the propeller main body; the sealing mechanism comprises a driving shaft sealing assembly, a paddle shaft sealing assembly, an auxiliary gravity oil tank, a deflation ball valve, a fourth paddle shaft sealing ring, a fourth sealing seat, a first driving shaft sealing pipe joint, a second driving shaft sealing pipe joint, a first paddle shaft sealing pipe joint and a second paddle shaft sealing pipe joint; the gravity oil tank and the sealing mechanism are arranged, the auxiliary gravity oil tank and the deflation ball valve are matched and communicate with the gravity oil tank and the propeller body, the driving shaft sealing ring makes contact with the driving shaft lining, the sealing effect can be achieved, the pressure borne by the sealing ring is reduced, and the propeller shaft sealing ring is used for preventing lubricating oil from leaking; the service life of the sealing ring is effectively prolonged, and the sealing effect of the sealing ring is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of thruster sealing, in particular to a sealing system for a lateral thruster. Background Technique

[0002] A lateral thruster is a ship thruster installed on the side of a ship. As an auxiliary steering device of the ship, it is widely used in the lateral movement of the ship when leaving or approaching the dock, adjusting the course during low-speed navigation in the waterway, suppressing the bow deflection during the reverse process, etc. The lateral thruster is suitable for ships with a high frequency of berthing and unberthing operations, such as ro-ro ships, large passenger ships, large container ships, semi-submersible ships, and some refined oil tankers, etc.

[0003] The sealing system of the lateral thruster belongs to a core system of it. The sealing system not only affects the normal operation of the lateral thruster, but also relates to the operation safety and environment of the whole ship. Once the sealing system fails, it will not only cause the entire lateral thruster to be unusable, resulting in the obstruction of ship navigation, but also the leaked lubricating oil will pollute the environment, bringing economic losses to the shipowner. Therefore, a sealing system for a lateral thruster is needed.

[0004] The sealing ability of the sealing ring depends on the thickness of the oil film on the sealing surface. If the thickness is too large, the sealing ring will leak; if the thickness is too small, dry friction may occur, causing wear of the sealing ring and the bushing; if there is no oil film between the lip of the sealing ring and the bushing, it is easy to cause heating and wear.

[0005] At present, the draft depth of large ships (such as crane ships, semi-submersible ships, transport ships, etc.) is often more than 5m. To ensure that the oil pressure at the propeller shaft seal is 0.15 - 0.25 bar higher than the water pressure, this puts higher requirements on the hanging height of the gravity oil tank. Sometimes the cabin cannot meet the hanging height requirement of the gravity oil tank, and external air needs to be introduced to meet the pressure requirement. However, this will inevitably cause the oil film formed between the sealing ring 602 of the drive shaft sealing structure and the bushing of the sealing ring 2203 of the propeller shaft sealing structure to continuously thin, and dry friction may occur, seriously affecting the service life and sealing effect of the sealing ring, and ultimately resulting in the leakage of lubricating oil.

[0006] The working pressure of ordinary sealing rings generally does not exceed 0.5 bar. When the working pressure exceeds this value, pressure-resistant sealing rings should be selected. However, the cost of pressure-resistant sealing rings is much higher than that of ordinary sealing rings. Content of the Utility Model

[0007] (I) Technical Problems to be Solved

[0008] In view of the deficiencies of the prior art, the utility model provides a sealing system for a lateral thruster, which can solve the technical problems put forward in the background technique.

[0009] (II) Technical Solutions

[0010] The present utility model is realized by the following technical solutions: A sealing system for a lateral thruster, comprising a thruster main body, a gravity oil tank detachably installed on the thruster main body, and a sealing mechanism; wherein, two sets of pipelines communicating with the thruster main body are arranged on the gravity oil tank. One pipeline is connected from the bottom of the gravity oil tank to the gearbox of the thruster main body, and its main functions are: ① used for refueling the thruster main body; ② when the thruster main body is running, as a channel to convey the expanded lubricating oil to the gravity oil tank; ③ the connecting pipeline between the gravity oil tank and the thruster main body to transmit the pressure of the gravity oil to the sealing part of the thruster main body. The other pipeline is connected from the upper part of the gravity oil tank to the gearbox of the thruster main body, mainly used for exhausting air when refueling the thruster main body; a drive shaft and a propeller shaft are arranged on the thruster main body; the sealing mechanism includes a drive shaft sealing assembly and a propeller shaft sealing assembly arranged on the thruster main body; the drive shaft sealing assembly includes a dynamic sealing structure and a static sealing structure; the static sealing structure includes a first O-ring and a second O-ring arranged on the drive shaft; the dynamic sealing structure further includes a drive shaft sealing ring member arranged on the drive shaft and a gland for fixing the drive shaft sealing ring member; the propeller shaft sealing assembly includes a propeller shaft, a propeller shaft bushing, a propeller shaft sealing ring member matched and connected with the propeller shaft bushing, and an end cover for fixing the propeller shaft sealing ring member; the sealing mechanism further includes an auxiliary gravity oil tank and a balloon valve connected to the thruster main body; the sealing mechanism further includes a fourth propeller shaft sealing ring and a fourth sealing seat matched and connected with the propeller shaft sealing ring member; the sealing mechanism further includes a first drive shaft sealing pipe joint and a second drive shaft sealing pipe joint symmetrically arranged on both sides of the drive shaft and a first propeller shaft sealing pipe joint and a second propeller shaft sealing pipe joint symmetrically arranged on both sides of the propeller shaft.

[0011] Preferably, a gland is arranged on the drive shaft and a dust-proof ring is arranged outside the drive shaft bushing and connected with the gland. A bearing seat and a flange arranged on the bearing seat are arranged on the thruster main body. The drive shaft is respectively connected with the flange and the bearing seat, and a spacer ring is arranged outside the drive shaft bushing.

[0012] Preferably, the drive shaft sealing ring member includes a first drive shaft sealing ring arranged inside the flange and a second drive shaft sealing ring connected with the first drive shaft sealing ring. The first O-ring is arranged between the flange and the bearing seat, the second O-ring is arranged between the drive shaft and the drive shaft bushing, and a set screw for connecting with the drive shaft is arranged on the drive shaft bushing.

[0013] Preferably, a gearbox connected to the propeller shaft is provided on the propeller main body. A first seal seat is provided on the outer side of the propeller shaft bushing, a second seal seat connected to the first seal seat, and a third seal seat connected to the second seal seat. The third seal seat is detachably installed on the gearbox. An anti-silt and sand seal ring that fits with the first seal seat is provided on the outer side of the propeller shaft bushing.

[0014] Preferably, the propeller shaft seal member includes a first propeller shaft seal ring provided inside the first seal seat, a second propeller shaft seal ring provided inside the second seal seat, and a third propeller shaft seal ring provided inside the third seal seat. The fourth propeller shaft seal ring is provided inside the fourth seal seat.

[0015] Preferably, the first drive shaft seal pipe joint and the second drive shaft seal pipe joint are respectively detachably installed on both sides of the flange. The first propeller shaft seal pipe joint and the second propeller shaft seal pipe joint are symmetrically installed on the gearbox respectively. A conduit is provided between the first drive shaft seal pipe joint, the second drive shaft seal pipe joint, the first propeller shaft seal pipe joint and the second propeller shaft seal pipe joint. The auxiliary gravity oil tank and the balloon release valve are both communicated through the conduit.

[0016] (III) Beneficial effects

[0017] Compared with the prior art, the present utility model provides a sealing system for a side thruster, having the following beneficial effects:

[0018] In this sealing system for a side thruster, through the provided gravity oil tank and sealing mechanism, the auxiliary gravity oil tank and the balloon release valve cooperate, and are respectively communicated with the gravity oil tank and the propeller main body. The drive shaft seal ring contacts the drive shaft bushing, which can play a sealing role, reduce the pressure on the seal ring, and the propeller shaft seal ring is used to prevent the leakage of lubricating oil, effectively prolong the service life of the seal ring, and improve the sealing effect of the seal ring. Description of the drawings

[0019] Figure 1 It is a partial structure diagram of the present utility model.

[0020] Figure 2 It is a partial structure diagram of the gravity oil tank and the sealing mechanism in the present utility model.

[0021] Figure 3 It is a partial structure diagram of the propeller shaft seal assembly in the present utility model.

[0022] In the figure: 1, gravity oil tank; 2, thruster main body; 3, drive shaft; 4, drive shaft bushing; 5, dust-proof ring; 6, drive shaft sealing ring parts; 601, first drive shaft sealing ring; 602, second drive shaft sealing ring; 7, flange; 8, bearing housing; 9, first O-ring; 10, spacer ring; 11, gland; 12, second O-ring; 13, setscrew; 14, paddle shaft; 15, paddle shaft bushing; 16, end cover; 17, first sealing seat; 18, second sealing seat; 19, third sealing seat; 20, gear box; 21, anti-silt and sand sealing ring; 22, paddle shaft sealing ring parts; 2201, first paddle shaft sealing ring; 2202, second paddle shaft sealing ring; 2203, third paddle shaft sealing ring; 2204, fourth paddle shaft sealing ring; 23, auxiliary gravity oil tank; 24, first drive shaft sealing pipe joint; 25, second drive shaft sealing pipe joint; 26, balloon release valve; 27, fourth sealing seat; 28, first paddle shaft sealing pipe joint; 29, second paddle shaft sealing pipe joint. Detailed implementation manners

[0023] Next, in combination with the accompanying drawings and specific implementation manners, the present utility model will be further described. It should be noted that, on the premise of no conflict, any combination of the following-described embodiments or technical features can form a new embodiment.

[0024] Embodiment 1: Please refer to Figure 1 - Figure 3, A sealing system for a lateral thruster in this embodiment includes a thruster main body 2, a gravity oil tank 1 detachably installed on the thruster main body 2, and a sealing mechanism. Among them, two sets of pipelines communicating with the thruster main body 2 are provided on the gravity oil tank 1. One pipeline is connected from the bottom of the gravity oil tank 1 to the gearbox 20 of the thruster main body 2, and its main functions are: ① used for refueling the thruster main body 2; ② when the thruster main body 2 is running, as a channel to convey the expanded lubricating oil to the gravity oil tank 1; ③ the connecting pipeline between the gravity oil tank 1 and the thruster main body 2 to transmit the pressure of the gravity oil to the sealing part of the thruster main body 2. The other pipeline is connected from the upper part of the gravity oil tank 1 to the gearbox 20 of the thruster main body 2, mainly used for exhausting gas when refueling the thruster main body 2. A drive shaft 3 and a propeller shaft 14 are provided on the thruster main body 2. The sealing mechanism includes a drive shaft sealing assembly and a propeller shaft sealing assembly provided on the thruster main body 2. The drive shaft sealing assembly includes a dynamic sealing structure and a static sealing structure. The sealing principle of the dynamic sealing structure is as follows: Since there is an oil film controlled by the sealing ring edge between the drive shaft sealing ring part 6 and the drive shaft bushing 4, this oil film has the characteristics of fluid lubrication. Under the action of the spring of the sealing ring itself and the gravity oil pressure, the stiffness of the oil film just forms a crescent surface at the end where the oil film contacts the air, preventing the leakage of the working medium, thereby realizing the sealing of the rotating shaft. The static sealing structure includes a first O-ring 9 and a second O-ring 12 provided on the drive shaft 3. The dynamic sealing structure also includes a drive shaft sealing ring part 6 provided on the drive shaft 3 and a gland 11 that can fix the drive shaft sealing ring part 6. The propeller shaft sealing assembly includes a propeller shaft 14, a propeller shaft bushing 15, a propeller shaft sealing ring part 22 that is matched and connected with the propeller shaft bushing 15, and an end cover 16 that can fix the propeller shaft sealing ring part 22. The sealing mechanism also includes an auxiliary gravity oil tank 23 and a balloon valve 26 connected to the thruster main body 2. The sealing mechanism also includes a fourth propeller shaft sealing ring 2204 and a fourth sealing seat 27 that are matched and connected with the propeller shaft sealing ring part 22. The sealing mechanism also includes a first drive shaft sealing pipe joint 24 and a second drive shaft sealing pipe joint 25 symmetrically arranged on both sides of the drive shaft 3, and a first propeller shaft sealing pipe joint 28 and a second propeller shaft sealing pipe joint 29 symmetrically arranged on both sides of the propeller shaft 14.

[0025] A gland 11 is provided on the drive shaft 3, and a dust-proof ring 5 is provided outside the drive shaft bushing 4 and connected to the gland 11. A bearing seat 8 and a flange 7 provided on the bearing seat 8 are provided on the thruster main body 2. The drive shaft 3 is respectively connected to the flange 7 and the bearing seat 8, and a spacer ring 10 is provided outside the drive shaft bushing 4.

[0026] The drive shaft seal member 6 includes a first drive shaft seal ring 601 disposed inside the flange 7 and a second drive shaft seal ring 602 connected to the first drive shaft seal ring 601. A first O-ring seal 9 is disposed between the flange 7 and the bearing housing 8. A second O-ring seal 12 is disposed between the drive shaft 3 and the drive shaft bushing 4. A set screw 13 connected to the drive shaft 3 is provided on the drive shaft bushing 4.

[0027] A gearbox 20 connected to the propeller shaft 14 is provided on the thruster main body 2. A first seal seat 17, a second seal seat 18 connected to the first seal seat 17, and a third seal seat 19 connected to the second seal seat 18 are provided on the outer side of the propeller shaft bushing 15. The third seal seat 19 is detachably mounted on the gearbox 20. A sediment-proof seal ring 21 that fits against the first seal seat 17 is provided on the outer side of the propeller shaft bushing 15.

[0028] The propeller shaft seal member 22 includes a first propeller shaft seal ring 2201 disposed inside the first seal seat 17, a second propeller shaft seal ring 2202 disposed inside the second seal seat 18, and a third propeller shaft seal ring 2203 disposed inside the third seal seat 19. A fourth propeller shaft seal ring 2204 is disposed inside the fourth seal seat 27.

[0029] The first drive shaft seal pipe joint 24 and the second drive shaft seal pipe joint 25 are respectively detachably mounted on both sides of the flange 7. The first propeller shaft seal pipe joint 28 and the second propeller shaft seal pipe joint 29 are symmetrically mounted on the gearbox 20. A conduit is provided between the first drive shaft seal pipe joint 24, the second drive shaft seal pipe joint 25, the first propeller shaft seal pipe joint 28, and the second propeller shaft seal pipe joint 29. The auxiliary gravity fuel tank 23 and the balloon release valve 26 are both connected through the conduit.

[0030] The hanging height of the auxiliary gravity oil tank 23 is generally lower than the heavy load waterline. The auxiliary gravity oil tank 23 is connected to the spacer ring 10 of the two sealing rings of the drive shaft 3. When the first drive shaft sealing ring 601 is under the pressure of the gravity oil tank 1, part of the pressure is offset by the auxiliary gravity oil tank 23. The final pressure it receives is the pressure formed by the height difference between the gravity oil tank 1 and the auxiliary gravity oil tank 23, which makes the oil film between the first drive shaft sealing ring 601 and the drive shaft bushing 4 thicker, effectively extending its service life and improving its sealing effect; the pressure received by the second drive shaft sealing ring 602 is the pressure formed by the height difference between the auxiliary gravity oil tank 23 and the sealing ring. Generally, the pressure is small, and its lubrication method is oil lubrication, and the heat dissipation is good; at the same time, if the first drive shaft sealing ring 601 fails, under the action of pressure, the liquid level of the auxiliary gravity oil tank 23 will rise, and the liquid level sensor installed in the gravity oil tank 1 will alarm to detect the fault in time; if the liquid level of the auxiliary gravity oil tank 23 decreases, it means that the second drive shaft sealing ring 602 fails. At this time, the volume of the auxiliary gravity oil tank 23 is limited and will not cause large-scale environmental pollution.

[0031] The auxiliary gravity oil tank 23 is connected to the chamber between the third propeller shaft sealing ring 2203 and the fourth propeller shaft sealing ring 2204 of the propeller shaft sealing assembly. When the fourth propeller shaft sealing ring 2204 is under the pressure of the gravity oil tank 1, part of the pressure is offset by the auxiliary gravity oil tank 23. The final pressure it receives is the pressure formed by the height difference between the gravity oil tank 1 and the auxiliary gravity oil tank 23, which makes the oil film between the fourth propeller shaft sealing ring 2204 and the propeller shaft bushing 15 thicker, effectively extending its service life and improving its sealing effect; the pressure received by the third propeller shaft sealing ring 2203 is the pressure formed by the height difference between the auxiliary gravity oil tank 23 and the sealing ring. Generally, the pressure is small, and its lubrication method is oil lubrication. The operating environment is underwater, the heat dissipation is good, and the sealing effect is good; if the fourth propeller shaft sealing ring 2204 fails, under the action of pressure, the liquid level of the auxiliary gravity oil tank 23 will rise, and the liquid level sensor installed in the gravity oil tank 1 will alarm to facilitate the timely detection of the fault; if the first propeller shaft sealing ring 2201 and the second propeller shaft sealing ring 2202 fail, under the action of pressure, seawater will backflow into the auxiliary gravity oil tank 23. At this time, the liquid level sensor of the auxiliary gravity oil tank 23 will alarm, and by observing whether the oil is emulsified, it can be judged whether it has entered water; the setting of the auxiliary gravity oil tank 23 can give an early warning of the failure of the propeller shaft seal, avoid the emulsification of a large amount of oil in the gearbox 20, and reduce economic losses and environmental pollution.

[0032] The sealing system for a lateral thruster, through the provided gravity oil tank 1 and sealing mechanism, with the assistance of the gravity oil tank 23 and the balloon release valve 26, is respectively connected to the gravity oil tank 1 and the thruster main body 2. The drive shaft sealing ring contacts the drive shaft bushing 4, which can play a sealing role, reduce the pressure on the sealing ring, and the paddle shaft sealing ring is used to prevent the leakage of lubricating oil, effectively extending the service life of the sealing ring and improving the sealing effect of the sealing ring.

[0033] The above embodiments are only the preferred embodiments of the present invention and cannot be used to limit the scope of protection of the present invention. Any non-substantive changes and substitutions made by those skilled in the art based on the present invention fall within the scope of protection required by the present invention.

Claims

1. A sealing system for a lateral thruster, characterized in that: include: A propeller body (2), a gravity oil tank (1) and a sealing mechanism; Wherein, the gravity oil tank (1) is provided with two sets of pipelines connected to the thruster body (2); The propeller body (2) is provided with a drive shaft (3) and a propeller shaft (14); The sealing mechanism comprises a drive shaft sealing assembly and a propeller shaft sealing assembly arranged on the propeller body (2); The drive shaft sealing assembly includes a dynamic sealing structure and a static sealing structure; The static sealing structure comprises a first O-ring (9) and a second O-ring (12) which are arranged on the drive shaft (3); The dynamic sealing structure also includes a drive shaft sealing ring (6) and a drive shaft bushing (4) arranged on the drive shaft (3); The propeller shaft sealing assembly comprises a propeller shaft (14), a propeller shaft bushing (15), a propeller shaft sealing ring (22) matched with the propeller shaft bushing (15), and an end cover (16) capable of fixing the propeller shaft sealing ring (22); The sealing mechanism further comprises an auxiliary gravity oil tank (23) and a release ball valve (26) connected to the thruster body (2); The sealing mechanism further comprises a fourth propeller shaft sealing ring (2204) and a fourth sealing seat (27) which are matched and connected to the propeller shaft sealing ring member (22); The sealing mechanism further comprises a first drive shaft sealing pipe joint (24) and a second drive shaft sealing pipe joint (25) symmetrically arranged on both sides of the drive shaft (3), and a first propeller shaft sealing pipe joint (28) and a second propeller shaft sealing pipe joint (29) symmetrically arranged on both sides of the propeller shaft (14).

2. A sealing system for a lateral thruster according to claim 1, characterized in that: The drive shaft (3) is provided with a pressure cover (11) and a dust ring (5) arranged on the outside of the drive shaft bushing (4) and connected to the pressure cover (11); the propeller body (2) is provided with a bearing seat (8) and a flange (7) arranged on the bearing seat (8); the drive shaft (3) is connected to the flange (7) and the bearing seat (8), respectively; and a spacer ring (10) is provided on the outside of the drive shaft bushing (4).

3. A sealing system for a lateral thruster according to claim 2, characterized in that: The drive shaft sealing ring component (6) comprises a first drive shaft sealing ring (601) arranged on the inner side of the flange (7) and a second drive shaft sealing ring (602) connected to the first drive shaft sealing ring (601); the first O-ring (9) is arranged between the flange (7) and the bearing seat (8); the second O-ring (12) is arranged between the drive shaft (3) and the drive shaft bushing (4); and the drive shaft bushing (4) is provided with a set screw (13) connected to the drive shaft (3).

4. A sealing system for a lateral thruster according to claim 1, characterized in that: The propeller body (2) is provided with a gear box (20) connected to the propeller shaft (14); the outer side of the propeller shaft bushing (15) is provided with a first sealing seat (17), a second sealing seat (18) connected to the first sealing seat (17), and a third sealing seat (19) connected to the second sealing seat (18); the third sealing seat (19) is detachably mounted on the gear box (20); and the outer side of the propeller shaft bushing (15) is provided with an anti-silt sealing ring (21) that fits the first sealing seat (17).

5. A sealing system for a lateral thruster according to claim 1, characterized in that: The propeller shaft sealing ring component (22) comprises a first propeller shaft sealing ring (2201) arranged on the inner side of a first sealing seat (17), a second propeller shaft sealing ring (2202) arranged on the inner side of a second sealing seat (18), and a third propeller shaft sealing ring (2203) arranged on the inner side of a third sealing seat (19); the fourth propeller shaft sealing ring (2204) is arranged on the inner side of a fourth sealing seat (27).

6. A sealing system for a lateral thruster according to claim 1, characterized in that: The first drive shaft sealing pipe joint (24) and the second drive shaft sealing pipe joint (25) are respectively detachably mounted on both sides of the flange (7); the first propeller shaft sealing pipe joint (28) and the second propeller shaft sealing pipe joint (29) are respectively symmetrically mounted on the gear box (20); conduits are provided between the first drive shaft sealing pipe joint (24), the second drive shaft sealing pipe joint (25), the first propeller shaft sealing pipe joint (28) and the second propeller shaft sealing pipe joint (29); and the auxiliary gravity oil tank (23) and the release ball valve (26) are both connected via the conduits.

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