CN220416235U - Sealing executing mechanism of compressed air control type ship stern sealing device - Google Patents
Sealing executing mechanism of compressed air control type ship stern sealing device Download PDFInfo
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- CN220416235U CN220416235U CN202321443844.4U CN202321443844U CN220416235U CN 220416235 U CN220416235 U CN 220416235U CN 202321443844 U CN202321443844 U CN 202321443844U CN 220416235 U CN220416235 U CN 220416235U
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- sealing
- compressed air
- lip
- holding force
- lip seals
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- 238000007789 sealing Methods 0.000 title claims abstract description 91
- 230000007246 mechanism Effects 0.000 title claims abstract description 10
- 239000013535 sea water Substances 0.000 claims abstract description 29
- 238000005299 abrasion Methods 0.000 claims abstract description 6
- 230000003068 static effect Effects 0.000 claims abstract description 4
- 239000010687 lubricating oil Substances 0.000 claims description 13
- 239000000314 lubricant Substances 0.000 claims description 5
- 230000008859 change Effects 0.000 claims description 4
- 239000003570 air Substances 0.000 claims description 3
- 239000000919 ceramic Substances 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 5
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Sealing Using Fluids, Sealing Without Contact, And Removal Of Oil (AREA)
- Sealing Devices (AREA)
- Sealing With Elastic Sealing Lips (AREA)
Abstract
The utility model relates to a sealing executing mechanism of a compressed air control type ship stern sealing device, which comprises a sealing bush and a sealing seat body, wherein the sealing bush is a movable ring, is connected with a propeller and rotates along with a propeller shaft; the sealing seat body is a static ring and is arranged on the propeller shell, one wear-resistant ring and four lip seals are arranged between the sealing seat body and the sealing bush, five cavities are formed, the lip seal holding force is adjustable, the holding force of two lip seals facing seawater is different, the outer holding force is smaller than the inner side, and the pressure loss generated when compressed air passes through the inner side seal can be compensated. When the sealing executing mechanism is adopted, the pressure difference between the inside and the outside of the lip seal changes faster when the draft changes or the ambient pressure changes relatively, and at the moment, the lip seal opening cannot be increased due to the sudden increase of the pressure difference to cause the internal leakage of sea water, and cannot be reduced due to the sudden decrease of the pressure difference to cause the abrasion of the lip seal, so that the working reliability and the service life of the stern sealing device are improved.
Description
Technical Field
The utility model relates to a compressed air control type ship stern sealing device, in particular to a sealing executing mechanism.
Background
At present, the ship stern sealing device has very mature in sealing performance, and the sealing mode mainly comprises labyrinth sealing, rotary dynamic sealing, packing sealing, mechanical sealing and the like. The working principle of the sealing device is that the sealing effect is achieved through the suction effect formed by the friction pair, or the sealing effect is achieved through the dynamic pressure water film formed by the friction pair, or the sealing effect is achieved through the throttling effect. The ship designer can choose a proper sealing form only according to technical parameters such as the propeller shaft diameter, the rotating speed, the use depth, the leakage amount requirement and the like of the target ship and the expense requirement. However, as the international marine environment organisation specifies the export of the marine vessel with respect to its offshore emission requirements, the conventional stern sealing arrangement is difficult to meet and must be upgraded. Advanced sealing manufacturers abroad have first developed and popularized and applied a novel stern sealing device, namely an air stern sealing device. The working principle of the air stern sealing device is that a lip seal facing sea water and a lip seal facing lubricating oil are arranged 2 ways, and compressed air with controllable pressure is introduced into the middle, so that the pressure of the compressed air is slightly higher or slightly lower than that of the sea water. In this way, the lip seal is either just lifted to allow air to escape to prevent seawater from entering, or just closed off from the seawater. Meanwhile, an air outlet is arranged in the air cavity, once seawater enters or lubricating oil leaks, the seawater is brought to the recovery bottle by the air flow, and zero emission of a pollution source is realized.
The air stern sealing device has the advantages of realizing zero emission, reducing the friction force between the lip type seal and the rotating shaft, reducing abrasion and prolonging service life. The difficulty is how to achieve accurate compressed air pressure and flow supply, lifting the lip seal as required and ensuring a stable opening. Particularly, under the working condition of great change of working water depth like a semi-submersible vessel and an ocean platform, when draft or sea water impact is great, whether the sealing executing mechanism has better anti-impact design and sensitive lifting or closing action is very important. Therefore, there is a need for innovative designs of seal performance structural limits and sensitivity adjustment capabilities.
Disclosure of Invention
The utility model aims to provide a sealing executing mechanism of a compressed air control type ship stern sealing device, which is an anti-impact and sensitivity-adjustable sealing structure, and is used for solving the problem that when the air stern sealing device encounters large draft change or pressure impact, the lip-type sealing opening is not responsive and causes leakage in time, and improving the working reliability of the air stern sealing device.
In order to achieve the above purpose, the technical scheme of the utility model is as follows: the sealing executing mechanism of the compressed air control type ship stern sealing device comprises a sealing bushing and a sealing seat body, wherein the sealing bushing is a movable ring, is connected with a propeller and rotates along with a propeller shaft; the sealing seat body is a static ring and is arranged on the propeller shell, a wear-resistant ring and four lip seals are arranged between the sealing seat body and the sealing bush to form five cavities, the holding force of the lip seals is adjustable, the holding force of two lip seals facing seawater is different, the holding force of the outer side is smaller than that of the inner side, and the pressure loss generated when compressed air passes through the inner side seal can be compensated.
Further, the sealing bush is made of stainless steel, and the outer surface of the sealing bush is plated with ceramic.
Further, the sealing seat body is provided with a compressed air channel and a lubricating oil channel; compressed air is supplied to the lip seal facing the seawater side through the cavity formed by the compressed air channel to the sealing ring; the lubricant is supplied to the lip seal facing the bearing side of the propeller through a lubricant channel to a cavity formed by the seal ring.
Furthermore, a limiting ring is arranged in the sealing seat body, and two lip seals facing the sea water side are both provided with the limiting ring and used for limiting the opening size of the lip seals when the lip seals are subjected to pressure difference abrupt change.
Further, the sealing seat body is provided with a cavity 1, a cavity 2, a cavity 0, a cavity 3 and a cavity 4 which are respectively filled with seawater, compressed air, lubricating oil and lubricating oil, the pressures are respectively P1, P2, P0, P3 and P4, and P1 is more than P2 and less than P0 and more than P3 and more than P4.
Furthermore, the two lip seals facing the sea water side are provided with adjusting springs, and the adjusting springs are used for adjusting the holding force of the lip seals through the adjusting springs, and the opened holding force is matched with the pressure of the compressed air; meanwhile, when the pressure difference P0-P2 is suddenly reduced, namely the sea water pressure is suddenly increased, the two lip seals tightly hold the rotating sealing bush, and the holding force can not cause excessive abrasion of the lip seals and the sealing bush.
The beneficial effects of the utility model are as follows:
when the compressed air control type ship stern sealing device sealing executing mechanism disclosed by the utility model is adopted, when the draft changes or the ambient pressure changes relatively, the pressure difference between the inside and the outside of the lip seal changes relatively rapidly, at the moment, the lip seal opening cannot be enlarged due to sudden pressure difference increase to cause seawater leakage, and cannot be reduced due to sudden pressure difference reduction to cause lip seal abrasion, so that the working reliability and the service life of the stern sealing device are improved.
Drawings
FIG. 1 is a schematic diagram of a seal actuator of a compressed air controlled marine stern seal of the present utility model;
fig. 2 is a partially enlarged view of a sealing actuator of the stern sealing device of the compressed air controlled ship according to the present utility model.
Detailed Description
The utility model will be further described with reference to the drawings and examples.
As shown in fig. 1 and 2, the sealing actuator of the compressed air control type ship stern sealing device comprises a sealing bush 1 and a sealing seat body 2.
The sealing bush 1 is a movable ring, is made of stainless steel and is plated with ceramic, is connected with the propeller through the mounting surface A and rotates along with the propeller shaft; the seal seat body 2 is a static ring and is arranged on the propeller shell through a mounting surface B, and comprises a wear-resistant ring 21, a first lip seal 22, a second lip seal 23, a third lip seal 24, a fourth lip seal 25, a first limiting ring 26, a second limiting ring 27, a connecting flange, a seal seat, a compressed air channel 28, a lubricating oil channel 29 and the like.
The sealing seat body 2 is internally provided with a wear-resistant ring 21 and four lip seals, the first lip seal 22 and the second lip seal 23 are installed facing seawater, and double protection is realized; the third lip seal 24 and the fourth lip seal 25 are installed facing the lubricating oil, and double protection is realized; a total of 5 cavities, namely a cavity 1a, a cavity 2b, a cavity 0c, a cavity 3d and a cavity 4e are formed; the holding force of the lip seals can be adjusted, the holding force of the first lip seal 22 is different from the holding force of the second lip seal 23, the holding force of the first lip seal 22 is slightly smaller than the holding force of the second lip seal 23, the pressure loss generated when compressed air passes through the second lip seal 23 and the lip of the second lip seal 23 is raised, and the first lip seal 22 is raised correspondingly.
The cavity 1a, the cavity 2b, the cavity 0c, the cavity 3d and the cavity 4e in the sealing seat body 2 are respectively communicated with seawater, compressed air, lubricating oil and lubricating oil, the pressures are respectively P1, P2, P0, P3 and P4, and P1 is more than P2 and less than P0 and more than P3 and more than P4.
The sealing seat body 2 is provided with a compressed air channel 28 and a lubricating oil channel 29; the compressed air is supplied to the first and second lip seals 22, 23 facing the sea water side through the cavity 0 formed by the sealing ring; the lubricant is supplied to the third and fourth lip seals 24, 25 facing the bearing side of the propeller via the cavity 0 formed by the sealing rings.
The sealing seat body 2 is internally provided with a first limiting ring 26 and a second limiting ring 27, the first lip seal 22 and the second lip seal 23 facing the sea water side are both provided with limiting rings, and when the pressure difference P0-P2 suddenly increases, namely when the sea water pressure suddenly decreases, the lips of the first lip seal 22 and the second lip seal 23 suddenly increase, so that the sea water is easily leaked. Therefore, the limiting ring can limit the opening size of the lip type seal when the lip type seal is subjected to abrupt pressure difference.
The holding forces of the first lip type seal 22 and the second lip type seal 23 can be adjusted by springs, and the opening holding force is matched and adapted with the pressure of compressed air. Meanwhile, when the pressure difference P0-P2 is suddenly reduced, namely the sea water pressure is suddenly increased, the lip seal tightly holds the rotating bushing, and at the moment, the holding force can not cause excessive abrasion of the lip seal and the bushing.
Claims (6)
1. A compressed air control formula boats and ships stern sealing device seals actuating mechanism which characterized in that: the sealing sleeve is a movable ring, is connected with the propeller and rotates along with the propeller shaft; the sealing seat body is a static ring and is arranged on the propeller shell, a wear-resistant ring and four lip seals are arranged between the sealing seat body and the sealing bush to form five cavities, the holding force of the lip seals is adjustable, the holding force of two lip seals facing seawater is different, the holding force of the outer side is smaller than that of the inner side, and the pressure loss generated when compressed air passes through the inner side seal can be compensated.
2. The compressed air controlled marine stern sealing device seal actuator of claim 1 wherein: the sealing bush is made of stainless steel, and the outer surface of the sealing bush is plated with ceramic.
3. The compressed air controlled marine stern sealing device seal actuator of claim 1 wherein: the sealing seat body is provided with a compressed air channel and a lubricating oil channel; compressed air is supplied to the lip seal facing the seawater side through the cavity formed by the compressed air channel to the sealing ring; the lubricant is supplied to the lip seal facing the bearing side of the propeller through a lubricant channel to a cavity formed by the seal ring.
4. The compressed air controlled marine stern sealing device seal actuator of claim 1 wherein: and a limiting ring is arranged in the sealing seat body, and two lip seals facing the sea water side are provided with limiting rings for limiting the opening size of the lip seals when the lip seals are subjected to pressure difference abrupt change.
5. The compressed air controlled marine stern sealing device seal actuator of claim 1 wherein: the cavity 1, the cavity 2, the cavity 0, the cavity 3 and the cavity 4 in the sealing seat body are respectively filled with seawater, compressed air, lubricating oil and lubricating oil, the pressures are respectively P1, P2, P0, P3 and P4, and P1 is more than P2 and less than P0 and more than P3 and more than P4.
6. The compressed air controlled marine stern sealing device seal actuator of claim 5 wherein: the two lip seals facing the sea water side are provided with adjusting springs, and the adjusting springs are used for adjusting the holding force of the lip seals through the adjusting springs, and the opened holding force is matched with the pressure of the compressed air; meanwhile, when the pressure difference P0-P2 is suddenly reduced, namely the sea water pressure is suddenly increased, the two lip seals tightly hold the rotating sealing bush, and the holding force can not cause excessive abrasion of the lip seals and the sealing bush.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321443844.4U CN220416235U (en) | 2023-06-07 | 2023-06-07 | Sealing executing mechanism of compressed air control type ship stern sealing device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321443844.4U CN220416235U (en) | 2023-06-07 | 2023-06-07 | Sealing executing mechanism of compressed air control type ship stern sealing device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220416235U true CN220416235U (en) | 2024-01-30 |
Family
ID=89654338
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321443844.4U Active CN220416235U (en) | 2023-06-07 | 2023-06-07 | Sealing executing mechanism of compressed air control type ship stern sealing device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220416235U (en) |
-
2023
- 2023-06-07 CN CN202321443844.4U patent/CN220416235U/en active Active
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