Ship tail shaft sealing device

Abstract

The utility model discloses a ship stern shaft sealing device, and belongs to the technical field of stern shaft sealing. Comprising a pneumatic tire sealing assembly which is connected to a tail shaft in a sleeving mode, a mechanical sealing assembly is installed on the side face of the pneumatic tire sealing assembly, the tail shaft is sleeved with the mechanical sealing assembly, the mechanical sealing assembly is detachably connected with the pneumatic tire sealing assembly, a filler sealing assembly is installed on the side face of the mechanical sealing assembly, and the filler sealing assembly is connected with the mechanical sealing assembly in an inserted mode. The packing sealing assembly comprises a static ring seat, at least three sets of packing and a sealing gland, wherein the static ring seat is connected to the stern shaft in a sleeving mode and located on the side face of the mechanical sealing assembly, the inner wall of the end, close to the mechanical sealing assembly, of the static ring seat makes contact with the surface of the stern shaft, the packing is connected to the stern shaft in a sleeving mode and located in the annular cavity, and the sealing gland is connected to the stern shaft in a sleeving mode and detachably connected with the static ring seat. According to the utility model, the water leakage problem of the tail shaft can be solved by replacing the filler in the filler sealing assembly, and the water leakage repair of the tail shaft can be completed without going up or entering a dock.

Description

Technical Field

[0001] The utility model belongs to the technical field of stern shaft sealing, and in particular relates to a ship stern shaft sealing device. Background Art

[0002] In order to prevent water from flowing into the ship along the propeller shaft outside the ship, ships are equipped with stern shaft sealing devices. The ship forms a seal through a water-lubricated sealing device. However, when the cooling water from the main engine has a poor cooling effect or a cooling water pipeline fails, the contact surface temperature of the sealing ring is too high, and the static ring is damaged at high temperature. In sea areas with more impurities in the sea water, mud or marine organisms enter between the main sealing pairs, causing the sealing ring to wear and produce poor sealing, etc., it will cause abnormal wear of the sealing device and cause serious water leakage problems. The existing sealing device must be replaced or repaired after the boat is discharged from the factory when water leakage occurs, and there are many maintenance procedures, complex maintenance processes, and long maintenance cycles. When encountering emergency tasks and under high mission requirements, it will greatly restrict the boat's transportation and security capabilities. Utility Model Content

[0003] Purpose of the utility model: to provide a ship stern shaft sealing device to solve the above-mentioned problems existing in the prior art.

[0004] Technical solution: A ship stern shaft sealing device, comprising a pneumatic seal assembly, which is sleeved on the stern shaft, a mechanical seal assembly is installed on the side of the pneumatic seal assembly, the mechanical seal assembly is sleeved on the stern shaft and detachably connected to the pneumatic seal assembly, a packing seal assembly is installed on the side of the mechanical seal assembly, the packing seal assembly is plug-connected to the mechanical seal assembly, wherein the packing seal assembly comprises:

[0005] A stationary ring seat is sleeved on the stern shaft and is located on the side of the mechanical seal assembly; the inner wall of the end of the stationary ring seat close to the mechanical seal assembly contacts the stern shaft surface, and an annular cavity is formed between the inner wall of the end away from the mechanical seal assembly and the outer wall of the stern shaft;

[0006] At least three groups of packings are sleeved on the stern shaft and located in the annular cavity;

[0007] The sealing gland is sleeved on the stern shaft and is detachably connected to the stationary ring seat.

[0008] Preferably, the ends of the packing are cut to form a 45° section, the packing is connected end to end and the end sections are in contact to form a packing ring, and the incisions of the packing ring are separated by 120° successively until the annular cavity is filled with the packing ring.

[0009] Preferably, the pneumatic tire sealing assembly comprises:

[0010] A sand-proof ring gland sleeved on the stern shaft;

[0011] A pneumatic tube seat is located on the side of the sand-proof ring gland and sleeved with the stern shaft; an annular groove is formed on the inner wall of the pneumatic tube seat close to the stern shaft;

[0012] A pneumatic tire, sleeved on the stern shaft and located in the annular groove;

[0013] A pneumatic tire clamp ring, located in the pneumatic tire and close to the inner wall of the annular groove;

[0014] The pipe joint passes through the telescopic air tube seat and is inserted into the air tube clamp ring; the axis of the pipe joint is perpendicular to the axis of the air tube seat.

[0015] Preferably, the pneumatic tire sealing assembly further comprises a sand-proof ring, which is arranged at the connection between the sand-proof ring pressure cover and the pneumatic tire seat, and the sand-proof ring is in contact with the stern shaft surface.

[0016] Preferably, the mechanical seal assembly comprises:

[0017] A shell is located on the side of the pneumatic seal assembly and is sleeved on the stern shaft; an accommodating cavity is formed between the end of the shell away from the pneumatic seal assembly and the stern shaft;

[0018] A fixing ring, sleeved on the stern shaft and located in the accommodating cavity;

[0019] A push sleeve seat, sleeved on the stern shaft and located on the side of the fixing ring;

[0020] A push sleeve is sleeved on the push sleeve seat; the push sleeve and the push sleeve seat are detachably connected;

[0021] A movable ring outer sleeve is sleeved on the push sleeve and partially abuts against the push sleeve seat;

[0022] A connecting part, one end of which is embedded in the movable ring housing, and the other end of which is connected to the packing seal assembly.

[0023] Preferably, the mechanical seal assembly further comprises a first sealing ring, which is arranged at the connection between the fixing ring and the push sleeve seat and is sleeved on the stern shaft.

[0024] Preferably, the mechanical seal assembly further comprises at least two sets of second sealing rings which are sleeved on the outer wall of the push sleeve seat, the second sealing rings are located between the push sleeve seat and the push sleeve, and a third sealing ring is installed between the push sleeve and the movable ring sleeve.

[0025] Beneficial effects: The utility model relates to a ship stern shaft sealing device, which forms multiple seals on the stern shaft by cooperating with a pneumatic seal assembly, a mechanical seal group and a packing seal assembly;

[0026] Secondly, the stern shaft leakage problem can be solved by replacing the packing in the packing seal assembly without going up the raft or entering the dock, which not only improves the efficiency of maintenance but also reduces the maintenance cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a cross-sectional view of the installation state of the utility model;

[0028] Figure 2 for Figure 1 Enlarged view of point A in the middle;

[0029] Figure 3 for Figure 1 Enlarged view of point B in the middle.

[0030] Figures 1 to 3 The figures are marked as follows: 1. static ring seat; 2. packing; 3. sealing gland; 4. sand-proof ring gland; 5. pneumatic tire seat; 6. pneumatic tire; 7. pneumatic tire clamping ring; 8. pipe joint; 9. sand-proof ring; 10. shell; 11. fixed ring; 12. push sleeve seat; 13. push sleeve; 14. dynamic ring sleeve; 15. connecting part; 16. first sealing ring; 17. second sealing ring; 18. third sealing ring. DETAILED DESCRIPTION

[0031] like Figures 1 to 3 As shown, the utility model provides a technical solution: a ship stern shaft sealing device, including a pneumatic seal assembly, a mechanical seal assembly and a packing seal assembly, which are sequentially sleeved on the stern shaft from the propeller to the engine room, that is, the pneumatic seal assembly is close to the propeller, and the packing seal assembly is close to the engine room, such as Figure 1 As shown, the pneumatic seal assembly and the mechanical seal assembly are connected by bolts, and the mechanical seal assembly and the packing seal assembly are connected by a connecting portion 15. In this embodiment, the connecting portion 15 uses an alloy ring and a static ring. The alloy ring is installed in the mechanical seal assembly, and the static ring is installed in the packing seal assembly. The connection between the mechanical seal assembly and the packing seal assembly can be completed. The pneumatic seal assembly, the mechanical seal group and the packing seal assembly cooperate to form multiple seals on the stern shaft.

[0032] In a further embodiment, the packing seal assembly includes a stationary ring seat 1, at least three groups of packings 2 and a sealing gland 3. In this embodiment, three groups of packings 2 are used, the stationary ring seat 1 is sleeved on the stern shaft, the stationary ring seat 1 is sleeved on the side of the mechanical seal assembly, the inner wall of the end of the stationary ring seat 1 close to the mechanical seal assembly is in contact with the stern shaft surface, and an annular cavity is formed between the inner wall of the end away from the mechanical seal assembly and the outer wall of the stern shaft, the packing 2 is sleeved on the stern shaft, and the packing 2 is located in the annular cavity. shaped cavity, the sealing gland 3 is sleeved on the stern shaft, the sealing gland 3 is detachably connected to the stationary ring seat 1, the end of the packing 2 is cut to form a 45° section, the packing 2 is connected end to end and the end sections are in surface contact to form a packing 2 ring, the wound joints of the packing 2 rings are separated by 120° in succession until the annular cavity is filled with the packing 2 rings. By adopting this laying method, the bearing force of the packing 2 can be uniform and the service life of the packing 2 can be extended. The sealing gland 3 is connected to the stationary ring seat 1 by bolts to limit and fix the packing 2.

[0033] In a further embodiment, the pneumatic tire sealing assembly includes a sand-proof ring pressure cover 4, a pneumatic tire seat 5, a pneumatic tire 6, a pneumatic tire clamping ring 7, a pipe joint 8 and a sand-proof ring 9, the sand-proof ring pressure cover 4 is sleeved on the stern shaft, the pneumatic tire seat 5 is located on the side of the sand-proof ring pressure cover 4, the pneumatic tire seat 5 is sleeved on the stern shaft, the pneumatic tire seat 5 is provided with an annular groove on the inner wall near the stern shaft, the pneumatic tire 6 is sleeved on the stern shaft, the pneumatic tire 6 is located in the annular groove, the pneumatic tire clamping ring 7 is located in the pneumatic tire, the pneumatic tire clamping ring 7 is close to the inner wall of the annular groove, the pipe joint 8 passes through the telescopic pneumatic tire seat 5, the pipe joint 8 is inserted into the pneumatic tire clamping ring 7, the axis of the pipe joint 8 is perpendicular to the axis of the pneumatic tire seat 5, the sand-proof ring 9 is arranged at the connection between the sand-proof ring pressure cover 4 and the pneumatic tire seat 5, and the sand-proof ring 9 contacts the stern shaft surface.

[0034] In a further embodiment, the mechanical seal assembly includes a shell 10, a fixed ring 11, a push sleeve seat 12, a push sleeve 13, a dynamic ring sleeve 14, a connecting portion 15, a first sealing ring 16 and a second sealing ring 17, the shell 10 is located on the side of the pneumatic seal assembly, the shell 10 is sleeved on the stern shaft, and an accommodating cavity is formed between the end of the shell 10 away from the pneumatic seal assembly and the stern shaft, the fixed ring 11 is sleeved on the stern shaft, the fixed ring 11 is located in the accommodating cavity, the push sleeve seat 12 is sleeved on the stern shaft, the push sleeve seat 12 is located on the side of the fixed ring 11, and the push sleeve 13 is sleeved on the push sleeve seat 1 2. The push sleeve 13 is detachably connected to the push sleeve seat 12. The dynamic ring sleeve 14 is sleeved on the push sleeve 13. The dynamic ring sleeve 14 partially abuts against the push sleeve seat 12. One end of the connecting portion 15 is embedded in the dynamic ring sleeve 14, and the other end is connected to the stationary ring seat 1 of the packing seal assembly. The first sealing ring 16 is arranged at the connection between the fixed ring 11 and the push sleeve seat 12 and is sleeved on the stern shaft. The second sealing ring 17 is sleeved on the outer wall of the push sleeve seat 12. The second sealing ring 17 is located between the push sleeve seat 12 and the push sleeve 13. A third sealing ring 18 is installed between the push sleeve 13 and the dynamic ring sleeve 14.

[0035] Through the above technical solution, the utility model can achieve the following working process:

[0036] The stern shaft is sealed by a pneumatic seal assembly and a mechanical seal assembly. When the stern shaft leaks, multiple groups of packings 2 are installed in the annular cavity, and the sealing cover 3 is installed on the static ring seat 1 to limit and fix the packing 2, so that the stern shaft leakage problem can be quickly solved.

[0037] The preferred embodiments of the present invention are described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the technical concept of the present invention, various equivalent transformations can be made to the technical scheme of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

Claims

1. A ship stern shaft sealing device, characterized in that: The invention comprises a pneumatic seal assembly, which is sleeved on the stern shaft, a mechanical seal assembly is installed on the side of the pneumatic seal assembly, the mechanical seal assembly is sleeved on the stern shaft and is detachably connected to the pneumatic seal assembly, a packing seal assembly is installed on the side of the mechanical seal assembly, the packing seal assembly is plug-connected to the mechanical seal assembly, wherein the packing seal assembly comprises: A stationary ring seat (1) is sleeved on the stern shaft and is located on the side of the mechanical seal assembly; the inner wall of the end of the stationary ring seat (1) close to the mechanical seal assembly contacts the stern shaft surface, and an annular cavity is formed between the inner wall of the end away from the mechanical seal assembly and the outer wall of the stern shaft; At least three groups of packings (2), sleeved on the stern shaft and located in the annular cavity; A sealing gland (3) is sleeved on the stern shaft and is detachably connected to the stationary ring seat (1).

2. A ship stern shaft sealing device according to claim 1, characterized in that: The ends of the packing (2) are cut to form a 45° section, the packing (2) is connected end to end and the end sections are in contact to form a packing (2) ring, and the joints of the packing (2) ring incisions are separated by 120° successively until the annular cavity is filled with the packing (2) ring.

3. A ship stern shaft sealing device according to claim 1, characterized in that: The pneumatic tire sealing assembly comprises: A sand-proof ring gland (4) sleeved on the stern shaft; A pneumatic tube seat (5) is located on the side of the sand-proof ring gland (4) and is sleeved on the stern shaft; an annular groove is formed on the inner wall of the pneumatic tube seat (5) close to the stern shaft; A pneumatic tire (6) sleeved on the stern shaft and located in the annular groove; A pneumatic tire clamp ring (7), located inside the pneumatic tire (6) and close to the inner wall of the annular groove; A pipe joint (8) passes through the telescopic pneumatic tube seat (5) and is inserted into the pneumatic tube clamp ring (7); the axis of the pipe joint (8) and the axis of the pneumatic tube seat (5) are perpendicular to each other.

4. A ship stern shaft sealing device according to claim 3, characterized in that: The pneumatic tube sealing assembly further comprises a sand-proof ring (9), which is arranged at the connection between the sand-proof ring gland (4) and the pneumatic tube seat (5), and the sand-proof ring (9) is in contact with the stern shaft surface.

5. A ship stern shaft sealing device according to claim 1, characterized in that: The mechanical seal assembly comprises: A shell (10) is located on a side of the pneumatic seal assembly and sleeved on the stern shaft; an accommodating cavity is formed between an end of the shell (10) away from the pneumatic seal assembly and the stern shaft; A fixing ring (11) sleeved on the stern shaft and located in the accommodating cavity; A push sleeve seat (12) sleeved on the stern shaft and located on the side of the fixing ring (11); A push sleeve (13) is sleeved on the push sleeve seat (12); the push sleeve (13) and the push sleeve seat (12) are detachably connected; A movable ring outer sleeve (14) is sleeved on the push sleeve (13) and partially abuts against the push sleeve seat (12); A connecting portion (15) has one end embedded in the moving ring housing (14) and the other end connected to the packing seal assembly.

6. A ship stern shaft sealing device according to claim 1, characterized in that: The mechanical seal assembly further comprises a first sealing ring (16), which is arranged at the connection between the fixing ring (11) and the push sleeve seat (12) and is sleeved on the stern shaft.

7. A ship stern shaft sealing device according to claim 5, characterized in that: The mechanical seal assembly also includes at least two sets of second sealing rings, which are sleeved on the outer wall of the push sleeve seat (12), the second sealing rings are located between the push sleeve seat (12) and the push sleeve (13), and a third sealing ring is installed between the push sleeve (13) and the movable ring sleeve (14).

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