Pneumatic balance type oil lubrication tail shaft sealing device for ship

Abstract

The utility model discloses a pneumatic balance type oil lubrication stern shaft sealing device for ships, which relates to the technical field of stern shaft sealing and comprises a stern shaft sealing seat main body, a sealing oil cavity, an air pressure balance cavity and a sealing isolation cavity are arranged on the inner wall of the stern shaft sealing seat main body, and the sealing oil cavity is positioned between the air pressure balance cavity and the sealing isolation cavity. A sealing assembly is installed on the inner wall of the stern shaft sealing seat body and located between the sealing oil cavity and the sealing isolation cavity, the sealing assembly is composed of an installation base ring, a conical rubber ring, a rubber base ring, an annular rubber cover, an annular rubber air bag and an annular spring, and the conical rubber ring is fixedly installed at the end, away from the sealing oil cavity, of the installation base ring. A sealing assembly composed of an installation base ring, a conical rubber ring, a rubber base ring, an annular rubber cover, an annular rubber air bag and an annular spring is arranged between a sealing oil cavity and a sealing isolation cavity, and the sealing assembly can effectively block oil in the sealing oil cavity, so that the oil in the sealing oil cavity can be effectively prevented from entering the sealing isolation cavity; and the probability of oil leakage is finally reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of stern shaft sealing, in particular to a pneumatically balanced marine oil-lubricated stern shaft sealing device. Background Art

[0002] Currently, most ships use an oil lubrication system for stern shaft seals, achieving sealing through the pressure differential between the oil and seawater. As the ship's draft increases, the pressure differential increases, increasing friction and wear between the seal and the stern shaft sleeve. If the seal fails, large amounts of seawater can rapidly intrude, damaging the stern tube and stern bearing, and causing lubricating oil to leak into the sea and rivers, polluting the environment. In the existing patent application with application number CN202321891801.2, a pneumatically balanced marine oil-lubricated stern shaft sealing device is proposed. Although the sealing oil chamber and the air pressure balance chamber are arranged in sequence from the hull to the propeller end, and the air pressure balance chamber is connected to the air pressure source, when the draft of the ship changes, the air pressure in the air pressure balance chamber is adjusted by the air pressure source to adjust the pressure difference between the air pressure balance chamber and the water side, so that the sealing ring works under a smaller load state, thereby achieving the purpose of reducing the wear rate of the sealing ring, thereby reducing the risk of damage to the stern tube and stern bearing, and the risk of lubricating oil polluting the environment; its The sealed oil chamber is connected to the oil and gas controller. When the air pressure in the air pressure balance chamber decreases, the oil pressure in the sealed oil chamber is reduced through the oil and gas controller to reduce the pressure difference between the air pressure balance chamber and the sealed oil chamber, thereby reducing the wear rate of the sealing ring between the air pressure balance chamber and the sealed oil chamber, thereby achieving the purpose of reducing the risk of lubricating oil in the oil pressure chamber being immersed in the air pressure balance chamber. However, when the pressure in the sealed oil chamber is high, the third sealing ring on it is easily pushed away, and then the oil in the sealed oil chamber is easily entered into the sealed isolation chamber, and finally the oil in the sealed isolation chamber is easy to push the fourth sealing ring away and leak out, so it needs to be improved. Utility Model Content

[0003] The main purpose of the utility model is to provide a pneumatically balanced marine oil-lubricated stern shaft sealing device, which can effectively solve the problems in the background technology.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A pneumatically balanced marine oil-lubricated stern shaft sealing device comprises a stern shaft sealing seat body, the inner wall of which is provided with a sealing oil chamber, an air pressure balance chamber, and a sealing isolation chamber, the sealing oil chamber being located between the air pressure balance chamber and the sealing isolation chamber, a sealing assembly being installed on the inner wall of the stern shaft sealing seat body and between the sealing oil chamber and the sealing isolation chamber, the sealing assembly being composed of a mounting base ring, a conical rubber ring, a rubber base ring, an annular rubber cover, an annular rubber airbag, and an annular spring, the conical rubber ring being fixedly mounted on one end of the mounting base ring away from the sealing oil chamber, the rubber base ring being fixedly mounted on one end of the conical rubber ring away from the mounting base ring, the annular rubber cover being fixedly mounted on the inner wall of the rubber base ring, the annular rubber airbag being fixedly mounted on the inner wall of the annular rubber cover, the annular spring being sleeved on the rubber base ring, and the sealing assembly being sleeved on the stern shaft sleeve.

[0006] Preferably, the stern shaft sleeve is fixedly mounted on the propeller end.

[0007] Preferably, a first sealing ring, a second sealing ring and a third sealing ring are fixedly installed on the inner wall of the stern shaft sealing seat body, the second sealing ring is located between the air pressure balance chamber and the sealing oil chamber, the first sealing ring is located on the side of the air pressure balance chamber away from the second sealing ring, and the third sealing ring is located on the side of the sealing isolation chamber away from the sealing assembly.

[0008] Preferably, the first sealing ring, the second sealing ring and the third sealing ring are all sleeved on the stern shaft sleeve.

[0009] Preferably, the mounting base ring on the sealing assembly is fixedly connected to the stern shaft sealing seat body.

[0010] Preferably, an annular mounting groove is provided on the outer wall of the rubber base ring on the sealing assembly, and the annular spring is installed in the annular mounting groove.

[0011] Compared with the prior art, the present invention has the following beneficial effects:

[0012] By arranging a sealing assembly consisting of a mounting base ring, a conical rubber ring, a rubber base ring, an annular rubber cover, an annular rubber airbag, and an annular spring between the sealing oil chamber and the sealing isolation chamber, the sealing assembly can effectively block the oil in the sealing oil chamber, thereby effectively preventing the oil in the sealing oil chamber from entering the sealing isolation chamber, and ultimately reducing the probability of oil leakage. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic structural diagram of the stern shaft sealing seat body after sectioning of the present invention;

[0014] Figure 2 This is a schematic diagram of the structure of the sealing component of the present invention after being disassembled;

[0015] Figure 3 This is a schematic diagram of the cross-section structure of the rubber base ring, annular rubber cover, and annular rubber airbag of the present invention;

[0016] Figure 4 For the utility model Figure 3 Magnified view of point A.

[0017] In the figure: 1. stern shaft seal seat body; 2. Sealing oil chamber; 3. Sealing assembly; 4. stern shaft sleeve; 5. Propeller end; 6. Air pressure balance chamber; 7. Sealing isolation chamber; 8. First sealing ring; 9. Second sealing ring; 10. Third sealing ring; 11. Mounting base ring; 12. Conical rubber ring; 13. Rubber base ring; 14. Annular rubber cover; 15. Annular rubber airbag; 16. Annular spring; 17. Annular mounting groove. DETAILED DESCRIPTION

[0018] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0019] See also Figure 1 、 Figure 2 、 Figure 3 、 Figure 4As shown, a pneumatically balanced marine oil-lubricated stern shaft sealing device includes a stern shaft sealing seat body 1. The inner wall of the stern shaft sealing seat body 1 is provided with a sealing oil chamber 2, an air pressure balance chamber 6, and a sealing isolation chamber 7. The sealing oil chamber 2 is located between the air pressure balance chamber 6 and the sealing isolation chamber 7. A sealing assembly 3 is installed on the inner wall of the stern shaft sealing seat body 1 and between the sealing oil chamber 2 and the sealing isolation chamber 7. The sealing assembly 3 consists of a mounting base ring 11, a conical rubber ring 12, a rubber base ring 13, an annular rubber cover 14, an annular rubber airbag 15, and an annular spring 16. The conical rubber ring 12 is fixedly mounted on the mounting base ring 11 away from the sealing oil chamber 2. One end of the rubber base ring 13 is fixedly mounted on the end of the conical rubber ring 12 away from the mounting base ring 11, the annular rubber cover 14 is fixedly mounted on the inner wall of the rubber base ring 13, the annular rubber airbag 15 is fixedly mounted on the inner wall of the annular rubber cover 14, the annular spring 16 is sleeved on the rubber base ring 13, the sealing assembly 3 is sleeved on the stern shaft sleeve 4, the stern shaft sleeve 4 is fixedly sleeved on the propeller end 5, and the first sealing ring 8, the second sealing ring 9, and the third sealing ring 10 are fixedly mounted on the inner wall of the stern shaft sealing seat body 1. The second sealing ring 9 is located between the air pressure balance chamber 6 and the sealing oil chamber 2. The first sealing ring 8 is located in the air pressure balance chamber 6 away from the sealing oil chamber 2. On one side of the second sealing ring 9, the third sealing ring 10 is located on the side of the sealing isolation chamber 7 away from the sealing assembly 3. The first sealing ring 8, the second sealing ring 9 and the third sealing ring 10 are all sleeved on the stern shaft sleeve 4. The sealed oil chamber 2 is connected to the oil and gas controller. When the air pressure in the air pressure balance chamber 6 decreases, the oil pressure in the sealed oil chamber 2 is reduced by the oil and gas controller to reduce the pressure difference between the air pressure balance chamber 6 and the sealed oil chamber 2, thereby reducing the wear rate of the second sealing ring 9 between the air pressure balance chamber 6 and the sealed oil chamber 2. The air pressure balance chamber 6 is connected to the air pressure source, and the air pressure source is used to adjust the air pressure in the air pressure balance chamber 6. When the draft of the ship changes, the air pressure in the air pressure balance chamber 6 is adjusted by the air pressure source. The air pressure source adjusts the air pressure in the air pressure balance chamber 6 to adjust the pressure difference between the air pressure balance chamber 6 and the water side, so that the first sealing ring 8 works under a smaller load state, thereby reducing the wear rate of the first sealing ring 8. A sealing assembly 3 consisting of a mounting base ring 11, a conical rubber ring 12, a rubber base ring 13, an annular rubber cover 14, an annular rubber airbag 15, and an annular spring 16 is arranged between the sealing oil chamber 2 and the sealing isolation chamber 7. The sealing assembly 3 can effectively block the oil in the sealing oil chamber 2, thereby effectively preventing the oil in the sealing oil chamber 2 from entering the sealing isolation chamber 7, and ultimately reducing the probability of oil leakage.

[0020] Furthermore, the mounting base ring 11 on the sealing assembly 3 is fixedly connected to the stern shaft sealing seat body 1, and an annular mounting groove 17 is provided on the outer wall of the rubber base ring 13 on the sealing assembly 3. The annular spring 16 is installed in the annular mounting groove 17. Under the elastic force of the annular spring 16, the annular rubber cover 14 and the annular rubber airbag 15 can be tightly attached to the stern shaft sleeve 4, so that under the elastic force of the annular spring 16, the annular rubber cover 14 and the annular rubber airbag 15 can effectively block the sealing oil chamber 2 and the sealing isolation chamber 7, thereby blocking the oil in the sealing oil chamber 2.

[0021] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments or to replace some of the technical features therein with equivalents. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the scope of protection of the present invention. The scope of protection claimed in this utility model is defined by the attached claims and their equivalents.

Claims

1. A pneumatically balanced marine oil-lubricated stern shaft sealing device, comprising a stern shaft sealing seat body (1), wherein the inner wall of the stern shaft sealing seat body (1) is provided with a sealing oil chamber (2), an air pressure balancing chamber (6), and a sealing isolation chamber (7), wherein the sealing oil chamber (2) is located between the air pressure balancing chamber (6) and the sealing isolation chamber (7), and wherein: A sealing assembly (3) is installed on the inner wall of the stern shaft sealing seat body (1) and between the sealing oil chamber (2) and the sealing isolation chamber (7). The sealing assembly (3) consists of a mounting base ring (11), a conical rubber ring (12), a rubber base ring (13), an annular rubber cover (14), an annular rubber airbag (15) and an annular spring (16). The conical rubber ring (12) is fixedly mounted on an end of the mounting base ring (11) away from the sealing oil chamber (2). The rubber base ring (13) is fixedly mounted on an end of the conical rubber ring (12) away from the mounting base ring (11). The annular rubber cover (14) is fixedly mounted on the inner wall of the rubber base ring (13). The annular rubber airbag (15) is fixedly mounted on the inner wall of the annular rubber cover (14). The annular spring (16) is sleeved on the rubber base ring (13). The sealing assembly (3) is sleeved on the stern shaft sleeve (4).

2. The pneumatically balanced marine oil-lubricated stern shaft sealing device according to claim 1, characterized in that: The stern shaft sleeve (4) is fixedly sleeved on the propeller end (5).

3. The pneumatically balanced marine oil-lubricated stern shaft sealing device according to claim 2, characterized in that: A first sealing ring (8), a second sealing ring (9), and a third sealing ring (10) are fixedly mounted on the inner wall of the stern shaft sealing seat body (1); the second sealing ring (9) is located between the air pressure balance chamber (6) and the sealing oil chamber (2); the first sealing ring (8) is located on a side of the air pressure balance chamber (6) away from the second sealing ring (9); and the third sealing ring (10) is located on a side of the sealing isolation chamber (7) away from the sealing assembly (3).

4. The pneumatically balanced marine oil-lubricated stern shaft sealing device according to claim 3, characterized in that: The first sealing ring (8), the second sealing ring (9), and the third sealing ring (10) are all sleeved on the stern shaft sleeve (4).

5. The pneumatically balanced marine oil-lubricated stern shaft sealing device according to claim 4, characterized in that: The mounting base ring (11) on the sealing assembly (3) is fixedly connected to the stern shaft sealing seat body (1).

6. The pneumatically balanced marine oil-lubricated stern shaft sealing device according to claim 5, characterized in that: An annular mounting groove (17) is provided on the outer wall of the rubber base ring (13) on the sealing assembly (3), and the annular spring (16) is installed in the annular mounting groove (17).

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