Underwater sealing structure

Abstract

The invention relates to the field of underwater sealing, in particular to an underwater sealing structure which is arranged between main equipment and a connecting shaft, the main equipment is connected with the connecting shaft through a bearing, the connecting shaft comprises a flange plate and a shaft body, and the underwater sealing structure is arranged between the bearing and the flange plate. The underwater sealing structure comprises a plurality of V-shaped ring sealing structures arranged between the main equipment and the flange plate, a plurality of framework oil seal sealing structures arranged between the main equipment and the shaft body, and pressure maintaining sealing structures arranged between every two adjacent V-shaped ring sealing structures and / or between every two adjacent framework oil seal sealing structures. The sealing structure has the advantages that through the combination of the inner and outer sealing piece V-shaped rings and the two sealing piece framework oil seals and the design of two pressure maintaining sealing structures, the sealing structure is not only suitable for the situation that the outer pressure in a deep water area is higher than the inner pressure, but also suitable for the situation that the inner pressure and the outer pressure in a shallow water area are similar, and meanwhile suitable for the complex working condition that rear equipment is dragged and connected to run.

Description

Technical Field

[0001] The invention relates to the field of underwater sealing, and in particular to an underwater sealing structure. Background Art

[0002] In the field of underwater sealing, there is an underwater sealing structure, which is mainly used to connect working equipment immersed in water. It is necessary to prevent water and debris from entering the main equipment, and prevent the lubricating fluid and other oils inside the main equipment from leaking, maintain the sealing effect at the junction of the main equipment and the working equipment, and also need to withstand a certain underwater pressure.

[0003] The prior art, such as the sealing structure and sealing design of the underwater sealing device disclosed in the Chinese invention patent application with application publication number CN117605834A, uses the pressure difference between the inside and outside of the pipeline to squeeze and deform the non-metallic sealing ring at the joint to fill the gap between the joints.

[0004] However, in shallow water areas, where the difference in internal and external pressures is small, the non-metallic seal cannot be squeezed and deformed to fill the gap in the joint, resulting in leakage. At the same time, there are problems such as the inner ring of the seal being unable to rub, rotate continuously, and connect to the working equipment.

[0005] Based on this, this case is brought forward. Summary of the invention

[0006] The purpose of the present invention is to provide an improved underwater sealing structure which is more suitable for working environments of underwater equipment under various conditions.

[0007] In order to achieve the above object, the technical solution of the present invention is as follows:

[0008] An underwater sealing structure is arranged between a main device and a connecting shaft. The main device and the connecting shaft are connected through a bearing. The connecting shaft includes a flange and a shaft body. The underwater sealing structure is arranged between the bearing and the flange. The underwater sealing structure includes a plurality of V-ring sealing structures arranged between the main device and the flange, a plurality of skeleton oil seal sealing structures arranged between the main device and the shaft body, and a pressure-maintaining sealing structure arranged between two adjacent V-ring sealing structures and / or two adjacent skeleton oil seal sealing structures.

[0009] Furthermore, one of the V-ring sealing structures is located at the outermost side of the connection between the main device and the flange, including a groove 1 opened on the main device and a sealing V-ring 1 installed in the groove 1, the main body of the sealing V-ring 1 is close to the groove 1, and the lip edge is close to the connecting shaft.

[0010] Furthermore, one of the V-ring sealing structures is located at the innermost side of the connection between the main equipment and the flange, including a groove 2 opened on the flange and a sealing V-ring 2 installed in the groove 2, wherein the main body of the sealing V-ring 2 is pressed against the groove 2 and the lip is pressed against the main equipment.

[0011] Furthermore, the pressure-maintaining sealing structure located between two adjacent V-ring sealing structures includes an annular V-shaped groove and an annular V-shaped protrusion arranged on the main device, and an annular V-shaped groove and an annular V-shaped protrusion arranged on the flange, the annular V-shaped groove and the annular V-shaped protrusion on the main device are arranged alternately, and the annular V-shaped groove and the annular V-shaped protrusion on the flange are arranged alternately;

[0012] The annular V-shaped groove on the main device is opposite to the annular V-shaped protrusion on the flange and maintains a gap. The annular V-shaped protrusion on the main device is opposite to the annular V-shaped groove on the flange and maintains a gap. All gaps are connected to form a zigzag flow channel connecting two adjacent V-ring sealing structures.

[0013] Furthermore, the turning angle of the zigzag flow channel is 90°.

[0014] Furthermore, one of the skeleton oil seal sealing structures is located on the side of the flange plate at the connection between the main equipment and the shaft body, including a groove three opened on the main equipment and a sealing skeleton oil seal one installed in the groove three. The sealing skeleton oil seal one is interference fit into the groove three and holds the shaft body tightly, with the lip facing the flange plate side; the sealing skeleton oil seal one has two or more pieces.

[0015] Furthermore, one of the skeleton oil seal sealing structures is located on the side of the bearing at the connection between the main equipment and the shaft body, including a groove four opened on the main equipment and a sealing skeleton oil seal two installed in the groove four. The sealing skeleton oil seal two is interference fit into the groove four and holds the shaft body tightly, with the lip facing the bearing side; there is one or more sealing skeleton oil seals two.

[0016] Furthermore, the shaft body located at the skeleton oil seal sealing structure is an optical axis.

[0017] Furthermore, the pressure-maintaining sealing structure located between two adjacent skeleton oil seal sealing structures includes a plurality of semicircular ring grooves provided on the main device and a plurality of semicircular ring grooves provided on the shaft body, and the semicircular ring grooves on the main device and the semicircular ring grooves on the shaft body correspond to each other and are arranged relatively;

[0018] The semicircular annular groove stores the buffer medium.

[0019] Furthermore, the buffer medium is a lubricant.

[0020] The advantages of the present invention are: through the combination of two sets of inner and outer sealing V-rings, two sets of sealing skeleton oil seals, and the design of two pressure-maintaining sealing structures, it is not only suitable for the situation where the external pressure in deep water areas is higher than the internal pressure, but also suitable for the situation where the internal and external pressures in shallow water areas are similar. At the same time, it is suitable for complex working conditions such as towing and connecting the rear equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 This is a schematic diagram of the structure of the underwater sealing structure in the embodiment;

[0022] Figure 2 for Figure 1 A magnified schematic diagram of part A in FIG.

[0023] Figure 3 for Figure 1 A magnified schematic diagram of part B in FIG.

[0024] Figure 4 It is a cross-sectional schematic diagram of a sealing skeleton oil seal in an embodiment;

[0025] Description of symbols

[0026] 1. Main equipment; 2. Bearing; 301. Shaft; 302. Flange; 4. Groove 1; 5. Seal V-ring 1; 6. Groove 2; 7. Seal V-ring 2; 8. Annular V-shaped groove; 9. Annular V-shaped protrusion; 10. Broken line flow channel; 11. Groove 3; 12. Seal skeleton oil seal 1; 13. Groove 4; 14. Seal skeleton oil seal 2; 15. Semicircular ring groove; 16. Metal skeleton; 17. Spring. DETAILED DESCRIPTION

[0027] The present invention is further described in detail below in conjunction with the embodiments. It should be understood that the directions or positional relationships indicated by the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside" and "outside" herein are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention.

[0028] This embodiment provides an underwater sealing structure, such as Figure 1 As shown, the underwater sealing structure is arranged between the main device 1 and the connecting shaft. The main device 1 is connected to the connecting shaft through the bearing 2. The connecting shaft includes a flange 302 and a shaft body 301. The underwater sealing structure is arranged between the bearing 2 and the flange 302.

[0029] The underwater sealing structure includes two V-ring sealing structures arranged between the main equipment 1 and the flange 302, two skeleton oil seal sealing structures arranged between the main equipment 1 and the shaft 301, a primary pressure-maintaining sealing mechanism arranged between two adjacent V-ring sealing structures, and a secondary pressure-maintaining sealing structure arranged between two adjacent skeleton oil seal sealing structures.

[0030] like Figure 2 As shown, one of the V-ring sealing structures is located at the outermost side of the connection between the main equipment 1 and the flange 302, including a groove 4 provided on the main equipment 1 and a sealing V-ring 5 installed in the groove 4, the main body of the sealing V-ring 5 is close to the groove 4, and the lip is close to the connecting shaft. This V-ring sealing structure is also called a primary seal. When the main equipment 1 is submerged in water for operation, the primary seal can block most of the silt and sand and gravel under the water, and can also buffer part of the water flow pressure.

[0031] like Figure 2 As shown, another V-ring sealing structure is located at the innermost side of the connection between the main device 1 and the flange 302, including a groove 26 opened on the flange 302 and a sealing V-ring 27 installed in the groove 26, the main body of the sealing V-ring 27 is close to the groove 26, and the lip is close to the main device 1. This V-ring sealing structure is also called a secondary seal, which is used to prevent the residual water liquid from breaking through the sealing V-ring 15 when the water flow pressure rises instantly when the main device 1 runs at high speed.

[0032] Continue to refer Figure 2 The primary pressure-maintaining sealing mechanism located between two adjacent V-ring sealing structures includes an annular V-shaped groove 8 and an annular V-shaped protrusion 9 provided on the main device 1, and an annular V-shaped groove 8 and an annular V-shaped protrusion 9 provided on the flange 302. The annular V-shaped groove 8 and annular V-shaped protrusion 9 on the main device 1 are arranged alternately, and the annular V-shaped groove 8 and annular V-shaped protrusion 9 on the flange 302 are arranged alternately. The annular V-shaped groove 8 on the main device 1 is opposite to the annular V-shaped protrusion 9 on the flange 302 and maintains a gap, and the annular V-shaped protrusion 9 on the main device 1 is opposite to the annular V-shaped groove 8 on the flange 302 and maintains a gap. All the gaps are connected to form a zigzag flow channel connecting two adjacent V-ring sealing structures. In this embodiment, the turning angle of the zigzag flow channel is 90°. When the water flow breaks through the primary seal and enters the zigzag flow channel 10, it will withstand 25% of the reaction force each time it passes a corner, so that the water pressure impact is released with 1 / 4 of the reaction force. When the water flow reaches the sealing V-ring 27 after more than two corners, the pressure is less than 30% of the initial pressure, so that the internal and external pressures tend to balance better, protecting the sealing element and extending the service life.

[0033] like Figure 3As shown, one of the skeleton oil seal sealing structures is located at the side of the flange 302 where the main device 1 is connected to the shaft 301, including a groove 3 11 opened on the main device 1 and a sealing skeleton oil seal 12 installed in the groove 3 11. The sealing skeleton oil seal 12 is inserted into the groove 3 11 and tightly holds the shaft 301, with the lip facing the flange 302. In this embodiment, the sealing skeleton oil seal 12 has two pieces. Figure 4 As shown, the sealing skeleton oil seal 1 12 is inlaid with a special metal skeleton 16, so that it can be inserted into the groove 3 11 of the main device 11 without deformation, and a spring 17 is provided at the lip to hold the connecting shaft tightly, and the lip faces outward to protect the external water from entering the main device 1. The skeleton oil seal sealing structure here is also called a three-stage seal.

[0034] like Figure 3 As shown, another skeleton oil seal sealing structure is located at the side of the connection between the main device 1 and the shaft 301 close to the bearing 2, including a groove 13 opened on the main device 1 and a seal skeleton oil seal 14 installed in the groove 13. The seal skeleton oil seal 14 is inserted into the groove 13 and tightly holds the shaft 301, with the lip facing the bearing 2 side; the seal skeleton oil seal 14 is provided in one piece. Figure 4 As shown, the sealing skeleton oil seal 2 14 is inlaid with a special metal skeleton 16, so that it can be inserted into the groove 4 13 of the main device 11 without deformation, and a spring 17 is provided at the lip to hold the connecting shaft tightly, and the lip faces inward to protect the gear lubricant in the main device 1 from leaking. The skeleton oil seal sealing structure here is also called a four-stage seal.

[0035] Preferably, the shaft body 301 is located at the skeleton oil seal sealing structure and is a smooth axis, so that the skeleton oil seal of the seal will not be scratched when the connecting shaft rotates during operation.

[0036] Continue to refer Figure 3 The secondary pressure-maintaining sealing mechanism located between the two skeleton oil seal sealing structures includes a plurality of semicircular ring grooves 15 provided on the main device 1 and a plurality of semicircular ring grooves 15 provided on the shaft body 301. The semicircular ring grooves 15 on the main device 1 and the semicircular ring grooves 15 on the shaft body 301 correspond to each other and are arranged relatively. Lubricating medium is stored in the semicircular ring grooves 15. The secondary pressure-maintaining sealing mechanism is used to maintain pressure balance on both sides and can lubricate and protect the lips of the skeleton oil seal of the seal to prevent wear.

[0037] This embodiment is more suitable for complex working environments with various conditions for connecting underwater working equipment by reasonably arranging the sealing structure, multi-level layers, and staggered vertical and horizontal sealing.

[0038] The above embodiments are only used to explain the concept of the present invention, rather than to limit the protection of the rights of the present invention. Any non-substantial changes to the present invention using this concept shall fall within the protection scope of the present invention.

Claims

1. An underwater sealing structure is arranged between a main device and a connecting shaft, the main device and the connecting shaft are connected through a bearing, the connecting shaft includes a flange and a shaft body, the underwater sealing structure is arranged between the bearing and the flange, and is characterized in that: The underwater sealing structure includes several V-ring sealing structures arranged between the main equipment and the flange, several skeleton oil seal sealing structures arranged between the main equipment and the shaft body, and a pressure-maintaining sealing structure arranged between two adjacent V-ring sealing structures and / or two adjacent skeleton oil seal sealing structures.

2. An underwater sealing structure according to claim 1, characterized in that: One of the V-ring sealing structures is located at the outermost side of the connection between the main equipment and the flange, including a groove 1 opened on the main equipment and a sealing V-ring 1 installed in the groove 1. The main body of the sealing V-ring 1 is close to the groove 1, and the lip is close to the connecting shaft.

3. An underwater sealing structure according to claim 1, characterized in that: One of the V-ring sealing structures is located at the innermost side of the connection between the main equipment and the flange, including a groove 2 opened on the flange and a sealing V-ring 2 installed in the groove 2. The main body of the sealing V-ring 2 is close to the groove 2, and the lip is close to the main equipment.

4. An underwater sealing structure according to claim 1, characterized in that: The pressure-maintaining sealing structure located between two adjacent V-ring sealing structures includes an annular V-shaped groove and an annular V-shaped protrusion arranged on the main device, and an annular V-shaped groove and an annular V-shaped protrusion arranged on the flange. The annular V-shaped groove and the annular V-shaped protrusion on the main device are arranged alternately, and the annular V-shaped groove and the annular V-shaped protrusion on the flange are arranged alternately. The annular V-shaped groove on the main device is opposite to the annular V-shaped protrusion on the flange and maintains a gap. The annular V-shaped protrusion on the main device is opposite to the annular V-shaped groove on the flange and maintains a gap. All gaps are connected to form a zigzag flow channel connecting two adjacent V-ring sealing structures.

5. An underwater sealing structure according to claim 4, characterized in that: The turning angle of the zigzag flow channel is 90°.

6. An underwater sealing structure according to claim 1, characterized in that: One of the skeleton oil seal sealing structures is located on the side of the flange plate where the main equipment is connected to the shaft body, and includes a groove three opened on the main equipment and a sealing skeleton oil seal one installed in the groove three. The sealing skeleton oil seal one is interference fit into the groove three and holds the shaft body tightly, with the lip facing the flange plate side; the sealing skeleton oil seal one has two or more pieces.

7. An underwater sealing structure according to claim 1, characterized in that: One of the skeleton oil seal sealing structures is located on the side of the bearing at the connection between the main equipment and the shaft body, including a groove four opened on the main equipment and a sealing skeleton oil seal two installed in the groove four. The sealing skeleton oil seal two is interference fit into the groove four and holds the shaft body tightly, with the lip facing the bearing side; there is one or more sealing skeleton oil seals two.

8. An underwater sealing structure according to claim 1, characterized in that: The shaft body is located at the skeleton oil seal sealing structure and is an optical axis.

9. An underwater sealing structure according to claim 1, characterized in that: The pressure-maintaining sealing structure located between two adjacent skeleton oil seal sealing structures includes a plurality of semicircular ring grooves provided on the main device and a plurality of semicircular ring grooves provided on the shaft body, wherein the semicircular ring grooves on the main device and the semicircular ring grooves on the shaft body correspond to each other and are arranged relatively; A buffer medium is stored in the semicircular annular groove.

10. An underwater sealing structure according to claim 9, characterized in that: The buffer medium is a lubricant.

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