Ship tail shaft sealing performance detection device and detection method thereof

Abstract

The invention belongs to a ship tail shaft sealing performance detection device in the technical field of ship tail shafts. A vacuum cavity (1) is formed between a stern tube (13) and a stern shaft (14) of the ship, the vacuum cavity (1) is communicated with a sealing pipeline (2) on the stern tube (13), the stern tube (13) is further provided with a lubricating branch (8), the lubricating branch (8) is communicated with the sealing pipeline (2), the lubricating branch (8) is simultaneously communicated with a lubricating pipeline (9) on a tail column (16), and the ship further comprises a plugging bolt (10) and a sealing screwed plug (11). According to the ship stern shaft sealing performance detection device and the detection method thereof, ship stern shaft sealing performance detection can be conveniently and rapidly completed, repair is avoided, and the problem of huge economic loss caused by inaccurate detection is solved.

Description

Technical Field

[0001] The invention belongs to the technical field of ship stern shafts, and more specifically, relates to a ship stern shaft sealing performance detection device. Background Art

[0002] 90% of the stern bearing lubrication methods of modern ships are oil lubricated, and 90% of the oil-lubricated stern shaft sealing devices use lip-type rubber sealing devices, such as B+U's SC series, KOBECO JMT series, NEPTUN series, ENGLE series, and other products to solve the problems of stern bearing oil leakage and seawater leakage. In order to prevent seawater pollution, there are strict test processes and inspection requirements for oil leakage in the dock after the sealing device is repaired, especially the tail end seal is more stringent. However, for the inspection of seawater leakage in the dock of the tail sealing device, it is impossible to design a tire for pounding because of the large components, various structural models, complex appearance, and small space. There has been no effective inspection process and reliable equipment. We can only wait until the ship is out of the dock or sailing to observe whether there is seawater in the lubricating oil system, whether the lubricating oil is emulsified, and whether the oil level in the lubricating oil tank rises to judge the seawater leakage. However, it is too late to observe at this time, and the ship will return to the factory for repair, which will bring huge economic losses. Therefore, the inspection method of seawater leakage in the dock has become a research topic for various ship repair and construction manufacturers. However, due to the special structure of the ship's stern shaft, general vacuum devices cannot achieve reliable sealing performance detection.

[0003] There is a technology named "a ship stern shaft end face sealing device" and the publication (announcement) number is "CN108506491A" in the prior art, which relates to a ship stern shaft end face sealing device and belongs to the field of ship technology. The present invention aligns the dynamic ring on the stern shaft with the static ring position to install the stern shaft in the sealing device, fixes the sealing device through the base, when the stern shaft rotates, the dynamic ring rotates with the rotation of the stern shaft, and prevents water from penetrating during the rotation process, when the stern shaft shakes violently, the dynamic ring shakes with the shaking of the stern shaft, and the gasket buffers the dynamic ring, when the stern shaft bends, the Ω-type elastic compensation device elastically compensates the sealing device, and the sealing device bends with the bending of the stern shaft, ensuring that the dynamic ring is always parallel to the static ring, preventing the dynamic ring from rubbing against the static ring, and at the same time, the Ω-type elastic compensation device can make the entire sealing device fit on the surface of the stern shaft to enhance the waterproof effect. The device of the present invention can avoid the collision between the static ring and the dynamic ring, solve the problem of stern shaft damage and shutdown, and both enhance the sealing performance of the sealing device and improve the compensation performance of the sealing device. This technology does not involve the technical problems and technical solutions of the present application. Summary of the invention

[0004] The technical problem to be solved by the present invention is: in view of the shortcomings of the existing technology, a ship stern shaft sealing performance detection device with a simple structure can be provided, which can conveniently and quickly complete the ship stern shaft sealing performance detection, avoid rework, and solve the problem of economic losses caused by inaccurate detection.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is:

[0006] The present invention is a device for detecting the sealing performance of a ship's stern shaft. A vacuum chamber is formed between the stern tube and the stern shaft of the ship. The vacuum chamber is connected to a sealing pipeline on the stern tube. A lubrication branch is also arranged on the stern tube. The lubrication branch is connected to the sealing pipeline. The lubrication branch is also connected to the lubrication pipeline on the stern column. The ship also includes a blocking bolt and a sealing plug.

[0007] The ship stern shaft sealing performance detection device comprises a connecting pipeline, one end of which is connected to a device pipe body, a device valve is arranged on the device pipe body, the other end of the device pipe body is connected to a device body, the device body is connected to a vacuum pulling component, and an air exhaust port is arranged at one end of the device body.

[0008] A plurality of sealing rings are arranged between the stern tube and the stern shaft, and a vacuum cavity is formed at the stern shaft and stern tube positions between adjacent sealing rings.

[0009] The outer ring of the stern shaft is provided with a connecting seat, the connecting seat is fixedly connected to the propeller, and the stern tube is sleeved on the outer ring of the connecting seat.

[0010] A vacuum gauge is also arranged on the device tube body.

[0011] One side of the stern tube is fixedly connected to the tail column.

[0012] When the sealing performance test of the ship stern shaft is not performed, the sealing thread plug is configured to be a structure that can be screwed onto the threaded portion of the sealing pipeline opening.

[0013] When the sealing performance of the ship's stern shaft is tested, the air extraction joint of the connecting pipeline is configured to be a structure that can be screwed onto the threaded portion of the sealing pipeline opening.

[0014] The sealing ring is embedded in the limiting groove of the stern tube.

[0015] The present invention also relates to a method for detecting the sealing performance of a ship's stern shaft, which has simple steps and can conveniently and quickly complete the detection of the sealing performance of a ship's stern shaft, avoid rework, and solve the problem of huge economic losses caused by inaccurate detection. The detection steps of the method for detecting the sealing performance of a ship's stern shaft are as follows:

[0016] S1. Open the sealing plug of the sealing pipeline on the stern tube, screw the exhaust joint of the connecting pipeline of the detection device to the threaded hole of the sealing pipeline, close the stop valve on the lubrication pipeline; open the device valve on the device body, and then start the vacuum pulling component to pull the vacuum;

[0017] S2. When the vacuum reaches the set pressure range (such as 0.03-0.05Mpa), close the device valve and observe that the vacuum pressure gauge does not drop pressure within 2 minutes, indicating that the sealing meets the requirements;

[0018] S3. If the vacuum pressure drops, it indicates that there is leakage. At this time, open the sealing plug screwed on the oil inlet pipeline and screw the plugging bolt onto the oil inlet pipeline. The plugging bolt blocks the connection between the lubrication pipeline and the sealing pipeline, eliminating the interference of the leakage of the stop valve of the lubricating oil pipeline and the lubrication pipeline on the sealing performance test;

[0019] S4. Pull the vacuum again by pulling the vacuum component, and check whether the vacuum pressure of the stern shaft seal drops to prove the installation quality of the stern seal; if the vacuum pressure still drops, it indicates that there is a seal leak and the seal needs to be replaced or maintained; if the vacuum pressure does not drop, it indicates that the leakage during the initial seal inspection came from the stop valve of the lubricating oil pipeline and the lubricating pipeline, and the stop valve of the lubricating oil pipeline and the lubricating pipeline needs to be replaced or maintained.

[0020] The technical solution of the present invention is adopted, and the working principle and beneficial effects are as follows:

[0021] The ship stern shaft sealing performance detection device described in the present invention is based on the negative pound process (vacuum pulling), and is designed to be light in weight, easy to move, and easy to use, and effectively meets the special structure of the ship stern shaft. The two cooperate with each other to complete the sealing performance detection. The detection device can be assembled on-site in the workshop for detection, and can also be detected on the ship in the dock. It is easy to move and suitable for use in different occasions, thereby effectively solving the problem of seawater leakage inspection in the dock, and can check whether the sealing components (sealing rings, oil seals) are leaking before refueling the stern shaft. When conducting a sealing performance test, the specific steps are: open the sealing plug of the sealing pipeline on the stern tube, screw the vacuum joint of the connecting pipeline of the detection device into the threaded hole of the sealing pipeline, and close the stop valve on the lubrication pipeline; open the device valve on the device body, and then start the vacuum pulling component to pull the vacuum; when the vacuum is observed to be 0.03-0.05Mpa, close the device valve, and observe that the vacuum pressure gauge does not drop pressure within 2 minutes, indicating that the sealing meets the requirements; if the vacuum pressure drops, it indicates that there is a leak. At this time, open the sealing plug screwed into the oil inlet pipeline, and screw the sealing bolt. Go to the oil inlet pipeline, and the sealing bolt blocks the connection between the lubrication pipeline and the sealing pipeline, eliminating the interference of the leakage of the stop valve of the lubricating oil pipeline and the lubrication pipeline on the sealing performance test. Pull the vacuum again by pulling the vacuum component, and check whether the vacuum pressure of the stern shaft seal is reduced to prove the installation quality of the tail seal; if the vacuum pressure still drops, it indicates that the sealing ring is leaking and needs to be replaced or maintained; if the vacuum pressure does not drop, it indicates that the leakage during the initial sealing detection came from the stop valve of the lubricating oil pipeline and the lubrication pipeline, and the stop valve of the lubricating oil pipeline and the lubrication pipeline needs to be replaced or maintained. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The following is a brief description of the contents and symbols in the drawings of this specification:

[0023] Figure 1 This is a schematic structural diagram of a ship stern shaft sealing performance detection device according to the present invention;

[0024] Figure 2 This is a schematic structural diagram of a ship stern shaft sealing performance detection device according to the present invention;

[0025] Figure 3 This is a schematic structural diagram of a ship stern shaft sealing performance detection device according to the present invention;

[0026] The following are marked as follows: 1. vacuum chamber; 2. sealing pipeline; 3. connecting pipeline; 4. device tube body; 5. device body; 6. vacuum pulling component; 7. air exhaust port; 8. lubrication branch; 9. lubrication pipeline; 10. blocking bolt; 11. sealing plug; 12. vacuum pressure gauge; 13. stern tube; 14. stern shaft; 15. device valve; 16. tail column; 17. limit groove; 18. connecting seat; 19. propeller; 20. air extraction joint; 21. oil inlet pipeline; 22. sealing ring. DETAILED DESCRIPTION

[0027] The following is a further detailed description of the specific implementation of the present invention, such as the shape, structure, mutual position and connection relationship between the various components involved, the function and working principle of each part, etc., through the description of the embodiments with reference to the accompanying drawings:

[0028] As attached Figure 1 -Attached Figure 3As shown, the present invention is a ship stern shaft sealing performance detection device, wherein a vacuum chamber 1 is formed between the stern tube 13 and the stern shaft 14 of the ship, the vacuum chamber 1 is connected to the sealing pipeline 2 on the stern tube 13, and a lubrication branch 8 is also arranged on the stern tube 13, the lubrication branch 8 is connected to the sealing pipeline 2, and the lubrication branch 8 is simultaneously connected to the lubrication pipeline 9 on the tail column 16, and the ship also includes a plugging bolt 10 and a sealing plug 11. The above structure proposes an improved technical solution for the deficiencies in the prior art. When the structure is set, based on the negative pound process (pulling vacuum), a detection device with light weight, convenient movement and convenient use is designed, which effectively meets the special structure of the ship stern shaft part, and the two cooperate with each other to complete the sealing performance detection. The detection device can be assembled on site in the workshop for detection, and can also be detected on the ship in the dock, which is convenient to move and suitable for use in different occasions, thereby effectively solving the problem of seawater leakage in the dock inspection, and can check whether the sealing components (sealing rings, oil seals) are leaking before the stern shaft is refueled. When conducting the sealing performance test, the specific steps are: open the sealing plug 11 of the sealing pipeline 2 on the stern tube 13, screw the exhaust joint 20 of the connecting pipeline 3 of the detection device into the threaded hole of the sealing pipeline 2, and close the stop valve on the lubrication pipeline 9; open the device valve 15 on the device body 4, and then start the vacuum pulling component 6 to pull the vacuum; when the vacuum is observed to be 0.03~0.05Mpa, close the device valve 15, and observe that the vacuum pressure gauge does not drop pressure within 2 minutes, indicating that the sealing meets the requirements; if the vacuum pressure drops, it indicates that there is a leakage. At this time, open the sealing plug 11 screwed on the oil inlet pipeline 21, and tighten the sealing bolt. 10 is screwed onto the oil inlet pipeline 21, and the plugging bolt 10 blocks the connection between the lubricating pipeline 9 and the sealing pipeline 2, eliminating the interference of the leakage of the lubricating oil pipeline 9 and the stop valve of the lubricating pipeline 9 on the sealing performance detection. The vacuum is pulled again by pulling the vacuum component 6 to check whether the vacuum pressure of the stern shaft seal has dropped to prove the installation quality of the tail seal; if the vacuum pressure still drops, it indicates that the sealing ring has leakage and needs to be replaced or maintained; if the vacuum pressure does not drop, it indicates that the leakage during the initial sealing detection comes from the stop valve of the lubricating oil pipeline 9 and the lubricating pipeline 9, and the stop valve of the lubricating oil pipeline 9 and the lubricating pipeline 9 need to be replaced or maintained. The ship stern shaft sealing performance detection device of the present invention has a simple structure and can conveniently and quickly complete the ship stern shaft sealing performance detection, avoiding rework and huge economic losses caused by inaccurate detection.

[0029] The ship stern shaft sealing performance detection device comprises a connecting pipeline 3, one end of the connecting pipeline 3 is connected to the device body 4, the device body 4 is provided with a device valve 15, the other end of the device body 4 is connected to the device body 5, the device body 5 is connected to the vacuum pulling component 6, and one end of the device body 5 is provided with an air exhaust port 7. In the above structure, when it is not necessary to detect the sealing performance, it is not necessary to use the detection device. At this time, the sealing pipeline 2 and the oil inlet pipeline 21 are respectively tightened and sealed by the sealing plug 11. When it is necessary to detect, the detection device is used, and the sealing plug 11 of the sealing pipeline 2 is first unscrewed to vacuumize. If the vacuum pressure does not drop within the set time, it indicates that the sealing performance meets the requirements. If the vacuum pressure drops, the sealing bolt 10 needs to be screwed to the oil inlet pipeline 21 for sealing, and then the vacuum is pulled for testing to accurately complete the sealing detection.

[0030] A plurality of sealing rings 15 are arranged between the stern tube 13 and the stern shaft 14, and the stern shaft 14 and the stern tube 13 between adjacent sealing rings 15 form a vacuum chamber 1. In the above structure, the sealing ring is used to achieve sealing between the stern tube 13 and the stern shaft 14, and a plurality of sealing rings can be arranged as needed.

[0031] The outer ring of the stern shaft 14 is provided with a connection seat 18, the connection seat 18 is fixedly connected to the propeller 19, and the stern tube 13 is sleeved on the outer ring of the connection seat 18. In the above structure, the sealing ring does not directly contact the stern shaft 14, but contacts the connection seat 18, and the connection seat 18 and the propeller are fixedly connected. When the ship is working, the propeller and the connection seat rotate under the driving power, and the stern tube 13 is fixed.

[0032] The device body 4 is also provided with a vacuum pressure gauge 12. In the above structure, the vacuum pressure gauge 12 displays the vacuum pressure value on the device body in real time, which is convenient for pressure monitoring.

[0033] The side surface of the stern tube 13 is fixedly connected to the tail column 15. In the above structure, the side surface of the stern tube 13 is fixedly connected to the tail column 15, so that the structure of the stern tube 13 is fixedly connected.

[0034] When the sealing performance of the ship stern shaft is not tested, the sealing plug 11 is configured to be screwed onto the threaded portion of the opening of the sealing pipeline 2. With the above structure, when sealing is not required, no detection device is required, and the sealing plug 11 can reliably seal the pipeline.

[0035] When the sealing performance of the ship's stern shaft is tested, the air extraction joint 20 of the connecting pipeline 3 is configured to be screwed onto the threaded portion of the oil inlet pipeline 21 of the sealing pipeline 2.

[0036] The sealing ring 15 is embedded in the limiting groove 17 of the stern tube 13. The above structure realizes the fixed connection between the sealing ring and the stern tube 13, avoids movement, and effectively improves the sealing reliability.

[0037] The present invention also relates to a method for detecting the sealing performance of a ship's stern shaft, which has simple steps and can conveniently and quickly complete the detection of the sealing performance of a ship's stern shaft, avoid rework, is suitable for the unique structural requirements of the ship's stern shaft, and solves the problem of huge economic losses caused by inaccurate detection. The detection steps of the method for detecting the sealing performance of a ship's stern shaft are as follows:

[0038] S1. Open the sealing plug 11 of the sealing pipeline 2 on the stern tube 13, screw the exhaust joint 20 of the connecting pipeline 3 of the detection device to the threaded hole of the sealing pipeline 2, close the stop valve on the lubrication pipeline 9; open the device valve 15 on the device body 4, and then start the vacuum pulling component 6 to pull the vacuum;

[0039] S2. When the vacuum reaches 0.03-0.05Mpa, close the device valve 15 and observe that the vacuum pressure gauge does not drop within 2 minutes, indicating that the sealing meets the requirements;

[0040] S3. If the vacuum pressure drops, it indicates that there is a leakage. At this time, the sealing plug 11 screwed on the oil inlet pipeline 21 is opened, and the plugging bolt 10 is screwed onto the oil inlet pipeline 21. The plugging bolt 10 blocks the connection between the lubrication pipeline 9 and the sealing pipeline 2, eliminating the interference of the leakage of the lubricating oil pipeline 9 and the stop valve of the lubrication pipeline 9 on the sealing performance detection;

[0041] S4. Pull the vacuum again by pulling the vacuum component 6, and check whether the vacuum pressure of the stern shaft seal drops to prove the installation quality of the stern seal; if the vacuum pressure still drops, it indicates that the seal ring is leaking and needs to be replaced or maintained; if the vacuum pressure does not drop, it indicates that the leakage during the initial seal detection comes from the stop valve of the lubricating oil pipeline 9 and the lubricating pipeline 9, and the stop valve of the lubricating oil pipeline 9 and the lubricating pipeline 9 needs to be replaced or maintained. The ship stern shaft sealing performance detection device of the present invention has a simple structure, can conveniently and quickly complete the ship stern shaft sealing performance detection, avoid rework, and solve the problem of huge economic losses caused by inaccurate detection. At the same time, the detection device effectively adapts to the special structure of the ship stern shaft.

[0042] The present invention is described above by way of example in conjunction with the accompanying drawings. It is obvious that the specific implementation of the present invention is not limited to the above-mentioned method. As long as various improvements are made using the method concept and technical solution of the present invention, or the concept and technical solution of the present invention are directly applied to other occasions without improvement, they are all within the protection scope of the present invention.

Claims

1. A ship stern shaft sealing performance detection device, characterized in that: A vacuum chamber (1) is formed between the stern tube (13) and the stern shaft (14) of the ship, the vacuum chamber (1) being connected to a sealed pipeline (2) on the stern tube (13), a lubrication branch (8) being provided on the stern tube (13), the lubrication branch (8) being connected to the sealed pipeline (2), and the lubrication branch (8) being connected to a lubrication pipeline (9) on a stern column (16) at the same time, the ship further comprising a blocking bolt (10) and a sealing plug (11).

2. The ship stern shaft sealing performance detection device according to claim 1, characterized in that: The ship stern shaft sealing performance detection device comprises a connecting pipeline (3), one end of the connecting pipeline (3) is connected to a device pipe body (4), a device valve (15) is arranged on the device pipe body (4), the other end of the device pipe body (4) is connected to a device body (5), the device body (5) is connected to a vacuum pulling component (6), and an air exhaust port (7) is arranged at one end of the device body (5).

3. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: A plurality of sealing rings (15) are arranged between the stern tube (13) and the stern shaft (14), and a vacuum chamber (1) is formed at the stern shaft (14) and the stern tube (13) between adjacent sealing rings (15).

4. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: The outer ring of the stern shaft (14) is provided with a connecting seat (18), the connecting seat (18) is fixedly connected to the propeller (19), and the stern tube (13) is sleeved on the outer ring of the connecting seat (18).

5. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: A vacuum gauge (12) is also provided on the device tube body (4).

6. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: One side of the stern tube (13) is fixedly connected to the tail column (15).

7. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: When the sealing performance test of the ship's stern shaft is not carried out, the sealing thread plug (11) is configured to be capable of being screwed onto the threaded portion of the opening of the sealing pipeline (2).

8. The ship stern shaft sealing performance detection device according to claim 1 or 2, characterized in that: When the sealing performance of the ship's stern shaft is tested, the air extraction joint (20) of the connecting pipeline (3) is configured to be a structure capable of being screwed onto the threaded portion of the opening of the sealing pipeline (2).

9. The ship stern shaft sealing performance detection device according to claim 3, characterized in that: The sealing ring (15) is embedded in the limiting groove (17) of the stern tube (13).

10. A method for detecting the sealing performance of a ship stern shaft, characterized in that: The detection steps of the ship stern shaft sealing performance detection method are as follows: S1. Open the sealing plug (11) of the sealing pipeline (2) on the stern tube (13), screw the exhaust joint (20) of the connecting pipeline (3) of the detection device into the threaded hole of the sealing pipeline (2), close the stop valve on the lubrication pipeline (9); open the device valve (15) on the device body (4), and then start the vacuum pulling component (6) to pull the vacuum; S2. When the vacuum reaches the set pressure range, close the device valve (15) and observe that the vacuum pressure gauge does not drop pressure within 2 minutes, indicating that the sealing meets the requirements; S3. If the vacuum pressure drops, it indicates that there is a leakage. At this time, the sealing plug (11) screwed onto the oil inlet pipeline (21) is opened, and the plugging bolt (10) is screwed onto the oil inlet pipeline (21). The plugging bolt (10) blocks the connection between the lubricating pipeline (9) and the sealing pipeline (2), thereby eliminating the interference of the leakage of the lubricating oil pipeline (9) and the stop valve of the lubricating pipeline (9) on the sealing performance detection; S4. Pull the vacuum again by pulling the vacuum component (6) to check whether the vacuum pressure of the stern shaft seal drops to prove the installation quality of the stern seal. If the vacuum pressure still drops, it indicates that there is a seal leak and the seal needs to be replaced or maintained. If the vacuum pressure does not drop, it indicates that the leakage during the initial seal inspection came from the stop valve of the lubricating oil pipeline (9) and the lubricating pipeline (9), and the stop valve of the lubricating oil pipeline (9) and the lubricating pipeline (9) need to be replaced or maintained.

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