Ship tail shaft compressed air sealing device

Abstract

The utility model discloses a ship stern shaft compressed air sealing device, which relates to the field of stern shaft sealing and comprises a stern shaft and a shaft sleeve, the stern shaft is movably mounted on the inner side of the shaft sleeve, a sealing ring positioned in the shaft sleeve is fixedly mounted outside the stern shaft, a connecting bolt is movably mounted on one side of the shaft sleeve, and the connecting bolt is fixedly mounted on the other side of the shaft sleeve. The shaft sleeve comprises a first outer shell and a second outer shell. The outer shell is divided into the first outer shell body and the second outer shell body through the shaft sleeve, the sealing edge strip and the alignment strip on the inner side of the second outer shell body are in butt joint with the first outer shell body, and the first fixing bolt penetrates through the fixing protruding strip to connect the first outer shell body and the second outer shell body. And a fixing ring is matched with a fixing bolt II to be mounted in a mounting groove, so that the fixing firmness is ensured, meanwhile, the outer shell I and the outer shell II are convenient to separate and disassemble, the sealing ring is convenient to disassemble and replace, and the sealing ring replacing efficiency of workers is further improved.

Description

Technical Field

[0001] The utility model relates to the field of tail shaft sealing, in particular to a compressed air sealing device for a ship's tail shaft. Background Art

[0002] The stern shaft, also known as the tail shaft, is the last section of the shaft system. The head end flange and the intermediate shaft flange are connected with tight bolts; the tail end is conical and used to install the propeller. The stern shaft is forged with high-quality carbon steel. Ocean-going ships are equipped with tail shaft sealing devices to prevent overboard water from flowing into the ship along the propeller shaft and lubricating oil from leaking out of the ship. The main shaft seal of the ship's rear transmission system is a special type of seal, which is characterized by a large shaft tube diameter and large lateral and axial vibrations. The seal is required to have automatic centering capabilities and vibration followability; the tail shaft works in seawater or river water environments. Seawater is severely corrosive, and the river water contains silt, which has an adverse effect on the seal; for oil-lubricated tail shaft seals, it is necessary to prevent lubricating oil from leaking out of the hull and polluting the marine environment, and to prevent seawater or river water from entering the tail shaft system, and to perform bidirectional sealing. There are three main types of tail shaft sealing devices: water-lubricated sealing devices, oil-lubricated sealing devices, and air sealing devices.

[0003] In the existing compressed air sealing device for the tail shaft of a ship, the tail shaft will synchronously drive the bushing to rotate when it rotates, which will cause certain wear to the sealing ring during long-term use. Therefore, in order to avoid leakage of sealing oil from the worn part of the sealing ring, the sealing ring needs to be replaced. However, the installation structure between the existing bushing and the outer shaft body is relatively complicated, which makes it difficult to remove the sealing ring and reduces the efficiency of replacing the sealing ring. Utility Model Content

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

[0005] A compressed air sealing device for a ship's tail shaft comprises a tail shaft and a shaft sleeve, wherein the tail shaft is movably mounted on the inner side of the shaft sleeve, a sealing ring located inside the shaft sleeve is fixedly mounted on the outside of the tail shaft, a connecting bolt is movably mounted on one side of the shaft sleeve, the shaft sleeve comprises an outer shell body 1 and an outer shell body 2, fixing convex strips are arranged on the upper and lower sides of the inner sides of the outer shell body 1 and the outer shell body 2, fixing bolt 1 is threadedly mounted on the outer side of the fixing convex strip, a sealing edge strip is fixedly clamped on the inner side of the outer shell body 2, and an alignment strip is arranged on the inner side of the outer shell body 2.

[0006] A further improvement of the technical solution of the utility model is that: an installation cavity is opened inside the outer shell one and the outer shell two, and an air pipe, an oil pipe, a water pumping pipe and a water volume sensing mechanism are fixedly installed inside the installation cavity.

[0007] A further improvement of the technical solution of the utility model is that: the front sides of the outer shells one and two are both provided with installation grooves, the interior of the installation grooves is fixedly clamped with a fixing ring, and the outer side of the fixing ring is movably mounted with fixing bolts two located in the outer shells one and two.

[0008] A further improvement of the technical solution of the utility model is that the second fixing bolts are distributed in an annular shape and installed on the outside of the fixing ring.

[0009] A further improvement of the technical solution of the utility model is that four sealing rings are arranged equidistantly along the direction of the tail shaft, and the four sealing rings are divided into a water cavity, an air cavity and an oil cavity from the outside to the inside.

[0010] A further improvement of the technical solution of the utility model is that: the air pipe is connected to the inside of the air cavity, the water pumping pipe and the water volume sensing mechanism are arranged in the water cavity, and the oil pipe is arranged in the inside of the oil cavity.

[0011] A further improvement of the technical solution of the utility model is that: a groove corresponding to the sealing edge strip and the alignment strip is opened on the inner side of the outer shell, and the sealing edge strip is arranged on the outer side of the alignment strip.

[0012] A further improvement of the technical solution of the utility model is that the sealing ring and the shaft sleeve are rotatably arranged.

[0013] Due to the adoption of the above technical solution, the utility model has achieved the following technical progress compared with the prior art:

[0014] The utility model provides a compressed air sealing device for a ship tail shaft, which is divided into an outer shell one and an outer shell two through a shaft sleeve, is butted with the outer shell one through a sealing edge strip and an alignment strip on the inner side of the outer shell two, is connected with the outer shell one through a fixing bolt one passing through a fixing convex strip, and is installed in an installation groove by using a fixing ring in combination with the fixing bolt two to ensure the firmness of the fixing, and is convenient for separating and disassembling the outer shell one and the outer shell two, thereby facilitating the disassembly and replacement of the sealing ring, and further improving the efficiency of the staff in replacing the sealing ring.

[0015] The utility model provides a compressed air sealing device for a ship's tail shaft. The device uses an oil pipe, a water pumping pipe, and a water volume sensing mechanism arranged inside a mounting cavity, and utilizes compressed air to increase the pressure inside an air cavity between a water cavity and an oil cavity, thereby preventing the penetration of seawater and oil. The device also utilizes the water volume sensing mechanism to extract seawater in the water cavity, thereby ensuring a sealing effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a structural schematic diagram of a compressed air sealing device for a ship's tail shaft according to the utility model;

[0017] Figure 2 It is a structural schematic diagram of the connecting bolt of the utility model;

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the utility model;

[0019] Figure 4 It is a schematic diagram of the structure explosion of the shaft sleeve of the utility model;

[0020] Figure 5 It is a schematic diagram of the cross-sectional structure of the shaft sleeve of the utility model.

[0021] In the figure: 1, tail shaft; 2, bushing; 21, outer shell one; 22, outer shell two; 23, fixing convex strip; 24, fixing bolt one; 25, sealing edge strip; 26, alignment strip; 27, mounting groove; 28, fixing ring; 29, fixing bolt two; 211, mounting cavity; 3, sealing ring; 4, connecting bolt; 5, air pipe; 6, oil pipe; 7, water pumping pipe; 8, water volume sensing mechanism. DETAILED DESCRIPTION

[0022] The utility model is further described in detail below:

[0023] like Figures 1 to 5 As shown, the utility model provides a compressed air sealing device for a ship's tail shaft, comprising a tail shaft 1 and a shaft sleeve 2, wherein the tail shaft 1 is movably mounted on the inner side of the shaft sleeve 2, a sealing ring 3 located inside the shaft sleeve 2 is fixedly mounted on the outside of the tail shaft 1, a connecting bolt 4 is movably mounted on one side of the shaft sleeve 2, the shaft sleeve 2 comprises an outer shell 1 21 and an outer shell 2 22, fixing convex strips 23 are arranged on the upper and lower sides of the inner sides of the outer shell 1 21 and the outer shell 2 22, fixing bolts 1 24 are threadedly mounted on the outer side of the fixing convex strip 23, a sealing edge strip 25 is fixedly clamped on the inner side of the outer shell 2 22, and an alignment strip 26 is arranged on the inner side of the outer shell 2 22.

[0024] It is divided into an outer shell 1 21 and an outer shell 2 22 by the shaft sleeve 2, and is docked with the outer shell 1 21 through the sealing edge strip 25 and the alignment strip 26 on the inner side of the outer shell 22, and the outer shell 1 21 and the outer shell 2 22 are connected by the fixing bolt 1 24 passing through the fixing convex strip 23, and are installed in the installation groove 27 by using the fixing ring 28 and the fixing bolt 29 to ensure the firmness of the fixation, and at the same time, it is convenient for the outer shell 1 21 and the outer shell 2 22 to be separated and disassembled, so as to facilitate the disassembly and replacement of the sealing ring 3, and further improve the efficiency of the staff in replacing the sealing ring 3. At the same time, the oil pipe 6, the water pumping pipe 7, the water volume sensing mechanism 8 and the air pipe 5 arranged inside the installation cavity 211, and the compressed air is used to increase the pressure inside the air cavity between the water cavity and the oil cavity to prevent the penetration of seawater and oil, and the water volume sensing mechanism 8 and the water pumping pipe 7 are used to extract the seawater in the water cavity to ensure the sealing effect.

[0025] like Figure 3 As shown, the outer shell 1 21 and the outer shell 2 22 are provided with an installation cavity 211 , and the air pipe 5 , the oil pipe 6 , the water pumping pipe 7 and the water volume sensing mechanism 8 are fixedly installed in the installation cavity 211 .

[0026] The air pipe 5 is arranged inside the air cavity to separate the water cavity and the oil cavity. The air pressure inside the air cavity is increased by the air compressor through the air pipe 5 to squeeze the infiltrated seawater outward, while avoiding the infiltration of the oil cavity. The water volume sensing mechanism 8 and the water pumping pipe 7 are used to detect the amount of seawater in the water cavity and pump water to ensure the sealing effect.

[0027] like Figure 4 As shown, the front sides of the outer shell 1 21 and the outer shell 2 22 are both provided with mounting grooves 27 , the interior of the mounting grooves 27 is fixedly clamped with a fixing ring 28 , and the outer side of the fixing ring 28 is movably mounted with fixing bolts 29 located in the outer shell 1 21 and the outer shell 2 22 .

[0028] The second fixing bolts 29 are arranged in a ring shape and installed on the outside of the fixing ring 28 .

[0029] The fixing ring 28 is clamped in the inside of the installation groove 27 and is fixedly installed in the outer shell 1 21 and the outer shell 2 22 in a ring shape from the outside by the fixing bolt 2 29 to strengthen the tightness of the connection between the outer shell 1 21 and the outer shell 2 22 and improve the sealing effect.

[0030] like Figure 3 As shown, four sealing rings 3 are equidistantly arranged along the direction of the tail shaft 1 , and the four sealing rings 3 are sequentially divided into a water chamber, an air chamber and an oil chamber from the outside to the inside.

[0031] The air pipe 5 is connected to the inside of the air cavity, the water pumping pipe 7 and the water volume sensing mechanism 8 are arranged in the water cavity, and the oil pipe 6 is arranged in the inside of the oil cavity.

[0032] By means of the oil pipe 6, the water extraction pipe 7, the water level sensing mechanism 8 and the air pipe 5 arranged inside the installation cavity 211, the pressure inside the air cavity between the water cavity and the oil cavity is increased by using compressed air to prevent the penetration of seawater and oil, and the water level sensing mechanism 8 and the water extraction pipe 7 are used to extract the seawater in the water cavity to ensure the sealing effect.

[0033] like Figure 4 As shown, the inner side of the outer shell 21 is provided with grooves corresponding to the sealing edge strip 25 and the alignment strip 26 , and the sealing edge strip 25 is arranged on the outer side of the alignment strip 26 .

[0034] The sealing ring 3 and the shaft sleeve 2 are rotatably arranged.

[0035] Through the grooves on the inner side of the outer shell 1 21 corresponding to the sealing edge strip 25 and the alignment strip 26, it is ensured that the outer shell 1 21 and the outer shell 2 22 are tightly connected to ensure the tightness of the connection.

[0036] The working principle of the compressed air sealing device of the ship's tail shaft is described in detail below.

[0037] like Figures 1 to 5 As shown, the shaft sleeve 2 is installed at the specified position by using the connecting bolts 4, and the tail shaft 1 is located inside the shaft sleeve 2. When the sealing ring 3 needs to be maintained, the fixing bolts 29 connected to the inside of the outer shell 1 21 and the outer shell 2 22 are first disassembled from the front side of the outer shell 1 21 and the outer shell 2 22 to remove the fixing ring 28 located in the installation groove 27 of the sealing arrangement, and the fixing bolts 1 24 connected to the inside of the outer shell 2 22 are disassembled from the side of the outer shell 1 21 to make the sealing edge strip 25 and the alignment strip 26 detach from the groove inside the outer shell 1 21, so that the outer shell 1 21 and the outer shell 2 22 are separated, so that the outer shell 1 21 and the outer shell 2 22 are located in the outer shell 1 21. The sealing ring 3 inside the body 1 21 and the outer shell 2 22 is exposed, which is convenient for replacing the sealing ring 3. It is relatively simple and there are no complicated operating steps, which improves the efficiency of the staff in maintaining and replacing the sealing ring 3. At the same time, through the air pipe 5, oil pipe 6, water pumping pipe 7, and water volume sensing mechanism 8 arranged inside the installation cavity 211, the air pipe 5 is connected to the air compressor, and the oil pipe 6 is connected to the oil supply mechanism. The air compressor compresses the air in the air cavity formed between the sealing rings 3 and located on the inner side of the water cavity to increase the pressure in the air cavity, so that the seawater that penetrates into the water cavity is squeezed to the outside for sealing, and at the same time, the oil cavity is prevented from penetrating into the air cavity.

[0038] The above generally describes the present invention in detail, but it is obvious to a person skilled in the art that some modifications or improvements can be made to the present invention. Therefore, modifications or improvements that do not deviate from the spirit of the present invention are within the scope of protection of the present invention.

Claims

1. A compressed air sealing device for a ship's tail shaft, comprising a tail shaft (1) and a shaft sleeve (2), characterized in that: The tail shaft (1) is movably mounted on the inner side of the shaft sleeve (2); a sealing ring (3) located inside the shaft sleeve (2) is fixedly mounted on the outer side of the tail shaft (1); a connecting bolt (4) is movably mounted on one side of the shaft sleeve (2); the shaft sleeve (2) comprises an outer shell body 1 (21) and an outer shell body 2 (22); fixing convex strips (23) are arranged on the upper and lower sides of the inner sides of the outer shell body 1 (21) and the outer shell body 2 (22); fixing bolts 1 (24) are threadedly mounted on the outer side of the fixing convex strip (23); a sealing edge strip (25) is fixedly clamped on the inner side of the outer shell body 2 (22); and a positioning strip (26) is arranged on the inner side of the outer shell body 2 (22).

2. A compressed air sealing device for a ship's tail shaft according to claim 1, characterized in that: The first outer shell (21) and the second outer shell (22) are provided with installation cavities (211), and the installation cavities (211) are fixedly provided with air pipes (5), oil pipes (6), water pumping pipes (7) and water volume sensing mechanisms (8).

3. A compressed air sealing device for a ship's tail shaft according to claim 1, characterized in that: The front sides of the outer shell one (21) and the outer shell two (22) are both provided with mounting grooves (27), the interior of the mounting grooves (27) is fixedly clamped with a fixing ring (28), and the outer side of the fixing ring (28) is movably mounted with fixing bolts (29) located inside the outer shell one (21) and the outer shell two (22).

4. A compressed air sealing device for a ship's tail shaft according to claim 3, characterized in that: The second fixing bolts (29) are arranged in a ring shape and installed on the outside of the fixing ring (28).

5. A compressed air sealing device for a ship's tail shaft according to claim 2, characterized in that: Four sealing rings (3) are arranged equidistantly along the direction of the tail shaft (1), and the four sealing rings (3) are divided into a water cavity, an air cavity and an oil cavity from the outside to the inside.

6. A compressed air sealing device for a ship's tail shaft according to claim 5, characterized in that: The air pipe (5) is connected to the inside of the air cavity, the water pumping pipe (7) and the water volume sensing mechanism (8) are arranged in the water cavity, and the oil pipe (6) is arranged in the inside of the oil cavity.

7. A compressed air sealing device for a ship's tail shaft according to claim 1, characterized in that: The inner side of the outer shell (21) is provided with a groove corresponding to the sealing edge strip (25) and the alignment strip (26), and the sealing edge strip (25) is arranged on the outer side of the alignment strip (26).

8. A compressed air sealing device for a ship's tail shaft according to claim 5, characterized in that: The sealing ring (3) is rotatably arranged on the shaft sleeve (2).

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