High-corrosion-medium-resistant loading arm rotating joint

Abstract

The utility model discloses a loading arm rotating joint resistant to high-corrosion media, and belongs to the technical field of loading arms. Comprising an interface flange, an inner sleeve and an outer sleeve, wherein the interface flange and the inner sleeve fixedly sleeve two sides of an interface of two adjacent pipe sections respectively; the outer sleeve rotationally sleeves the inner sleeve and is connected with the interface flange through a plurality of fastening bolts; the main sealing structure is located between the connector flange and the inner sleeve and arranged at the connector of the two pipe sections in a sleeving mode, the composite sealing structure is located between the outer sleeve and the inner sleeve and arranged at the end, close to the connector flange, of the inner sleeve in a sleeving mode, and a sealing sleeve is arranged between the composite sealing structure and the outer sleeve. The utility model can work stably for a long time in a high-corrosion environment, and meanwhile, the excellent sealing performance in the use process is ensured, so that the applicability and the operation safety in a corrosive medium environment are improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of loading arms, and particularly relates to a swivel joint of a loading arm resistant to highly corrosive media. Background Art

[0002] In modern fluid loading and unloading operations, a loading arm (fluid loading and unloading arm) is a commonly used device that can achieve rapid and safe loading and unloading of fluid media such as liquids and gases. As a key component of the loading arm, the swivel joint can enable the flexible rotation of each section of the loading arm. It is arranged at the interface of adjacent two sections of pipe joints, and its main function is to allow the rotation operation of each section of the loading arm while maintaining the continuous transmission of fluid media, so as to adapt to the loading and unloading requirements in different orientations. Its performance directly affects the operation efficiency and safety of the entire fluid transmission system. However, due to certain limitations in the seal design of traditional swivel joints, their corrosion resistance is poor, and they cannot well adapt to corrosive media. Especially when dealing with strong acids, strong alkalis or special chemicals, the single seal element of the traditional swivel joint is prone to wear and aging due to poor corrosion resistance, resulting in a decline in its sealing performance. And because there is only one seal, the sealing performance of the entire swivel joint is poor, and medium leakage is likely to occur during the rotation movement, leading to environmental pollution and safety accidents.

[0003] Therefore, there is a need for a swivel joint of a loading arm resistant to highly corrosive media that has strong corrosion resistance and high sealing performance at the same time. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a swivel joint of a loading arm resistant to highly corrosive media, which can work stably for a long time in a highly corrosive environment and ensure excellent sealing performance during use, so as to improve its applicability and operation safety in a corrosive media environment.

[0005] To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A swivel joint of a loading arm resistant to highly corrosive media includes an interface flange and an inner sleeve respectively fixedly sleeved on both sides of the interface of adjacent two sections of pipe joints, an outer sleeve rotatably sleeved on the inner sleeve and connected to the interface flange through a plurality of fastening bolts, a main sealing structure located between the interface flange and the inner sleeve and sleeved at the interface of the two sections of pipe joints, and a composite sealing structure located between the outer sleeve and the inner sleeve and sleeved at one end of the inner sleeve close to the interface flange. A sealing sleeve is arranged between the composite sealing structure and the outer sleeve.

[0007] A further improvement of the technical solution of the utility model lies in that: fitting grooves adapted to the main sealing structure are cooperatively opened on the end faces of the opposite ends of the interface flange and the inner sleeve. The main sealing structure includes a main sealing ring closely placed in the fitting groove and an O-ring I embedded on the end face of the main sealing ring close to the interface flange.

[0008] A further improvement of the technical solution of the utility model lies in that: mounting grooves for fitting a composite sealing structure and a sealing sleeve are cooperatively formed on the side walls of the outer sleeve and the inner sleeve on the opposite sides, and the composite sealing structure includes a plurality of sealing gaskets one and O-ring seals two alternately placed in the mounting grooves.

[0009] A further improvement of the technical solution of the utility model lies in that: a sealing platform is circumferentially provided at one end of the sealing sleeve close to the interface flange, and when it is sleeved on the composite sealing structure, the sealing platform is located between the interface flange and the outer sleeve.

[0010] A further improvement of the technical solution of the utility model lies in that: a plurality of circumferentially arranged rotating grooves are cooperatively formed on the side walls of the outer sleeve and the inner sleeve on the opposite sides on one side of their mounting grooves, and each rotating groove is evenly spaced along the length direction of the inner sleeve or the outer sleeve, and a plurality of balls are arranged in each rotating groove.

[0011] A further improvement of the technical solution of the utility model lies in that: a plurality of mounting holes communicating with its rotating grooves are formed on one side wall of the outer sleeve along its length direction, and the mounting holes are adapted to the balls and provided with plugging bolts, and an oil injection hole located between two adjacent rotating grooves is formed through on the other side wall, and a straight-through pressure oil cup is arranged on the oil injection hole.

[0012] A further improvement of the technical solution of the utility model lies in that: a sealing gasket two and an O-ring seal three are sleeved at one end of the inner sleeve far from the interface flange and located between it and the outer sleeve.

[0013] A further improvement of the technical solution of the utility model lies in that: the main sealing ring is made of carbon fiber-containing polytetrafluoroethylene material, the sealing sleeve, the sealing gasket one and the sealing gasket two are all made of polytetrafluoroethylene material, and the O-ring seal one, the O-ring seal two and the O-ring seal three are all made of perfluoroether material.

[0014] Due to the adoption of the above technical solution, the technical progress achieved by the utility model is:

[0015] The swivel joint of the loading arm of the utility model resistant to highly corrosive media has a compact overall design structure, is small in size, light in weight and flexible in rotation, can work stably for a long time in a highly corrosive environment, and at the same time ensures excellent sealing performance during use, so as to improve its applicability and operation safety in a corrosive medium environment.

[0016] The utility model is provided with a plurality of rotating grooves on the side walls of the opposite sides of the outer sleeve and the inner sleeve, and each rotating groove is arranged at uniform intervals along the length direction of the inner sleeve or the outer sleeve. A plurality of balls are arranged in each rotating groove, so that the inner sleeve can drive the pipe joint to rotate in the outer sleeve. A plurality of mounting holes corresponding to the rotating grooves are formed through on one side wall of the outer sleeve, and the mounting holes are adapted to the balls and provided with plug bolts. By screwing the plug bolts to open or close the mounting holes, the balls can be conveniently taken and placed in the rotating grooves. An oil injection hole is formed through on the side wall of the other side of the outer sleeve between two adjacent rotating grooves, and a straight-through pressure grease cup is arranged on the oil injection hole. Grease can be injected between the inner sleeve and the outer sleeve through the straight-through pressure grease cup, making the rotation between the outer sleeve and the inner sleeve smoother.

[0017] The utility model adopts multiple sets of sealing mechanisms such as a main sealing structure, a composite sealing structure and a sealing sleeve to maximize the sealing performance during use. The main sealing structure includes a main sealing ring made of carbon fiber-containing polytetrafluoroethylene material and an O-ring seal one made of perfluoroether material, which have excellent anti-corrosion and wear-resistant properties; the composite sealing structure includes a plurality of sealing gaskets one made of polytetrafluoroethylene material and O-ring seals two made of perfluoroether material that are alternately arranged, which can form multiple sealing structures between the outer sleeve and the inner sleeve, enabling the swivel joint to still maintain effective sealing performance when the main sealing structure fails; the sealing sleeve is made of polytetrafluoroethylene material, and a sealing platform is circumferentially arranged at one end close to the interface flange. When it is sleeved on the composite sealing structure, the sealing platform is located between the interface flange and the outer sleeve and is pressed tightly by fastening bolts, forming a tight and effective seal between the inner sleeve, the outer sleeve and the interface flange to prevent medium leakage, greatly improving the sealing performance of the entire swivel joint. Brief Description of the Drawings

[0018] Figure 1 is a schematic structural view of the swivel joint of the utility model;

[0019] Figure 2 is an assembly schematic view of the main sealing structure, the composite sealing structure and the sealing sleeve in the swivel joint of the utility model;

[0020] Wherein, 1. Interface flange, 2. Main sealing ring, 3. Sealing sleeve, 4. O-ring seal two, 5. Sealing gasket one, 6. Outer sleeve, 7. Plug bolt, 8. Ball, 9. Inner sleeve, 10. O-ring seal three, 11. O-ring seal one, 12. Straight-through pressure grease cup, 13. Fastening bolt, 14. Sealing gasket two. Detailed Description of the Invention

[0021] The following further describes the utility model in detail with reference to the embodiments:

[0022] As Figure 1 and Figure 2As shown in the figure, the utility model provides a swivel joint for loading arms resistant to highly corrosive media, which includes an interface flange 1, an inner sleeve 9, an outer sleeve 6, a main sealing structure, a composite sealing structure, and a sealing sleeve 3. The interface flange 1 and the inner sleeve 9 can be respectively fixed and sleeved on both sides of the interfaces of adjacent two pipe sections by welding. The outer sleeve 6 is rotatably sleeved on the inner sleeve 9. The top end of the outer sleeve 6 is connected to the interface flange 1 by a plurality of fastening bolts 13, so that the inner sleeve 9 can drive one of the pipe sections to rotate within the outer sleeve 6. The main sealing structure is located between the interface flange 1 and the inner sleeve 9 and is sleeved at the interfaces of the two pipe sections. The composite sealing structure is located between the outer sleeve 6 and the inner sleeve 9 and is sleeved at one end of the inner sleeve 9 close to the interface flange 1. A sealing sleeve 3 is arranged between the composite sealing structure and the outer sleeve 6. The sealing sleeve 3 is sleeved on the composite sealing structure, and the sealing sleeve 3 is made of polytetrafluoroethylene material.

[0023] Specifically, assembly grooves are cooperatively formed on the end faces of the opposite ends of the interface flange 1 and the inner sleeve 9. The assembly grooves are circumferentially arranged and adapted to the main sealing structure. The main sealing structure includes a main sealing ring 2 made of carbon fiber-containing polytetrafluoroethylene material and a first O-ring 11 made of perfluoroether material. The main sealing ring 2 is tightly placed in the assembly groove, and the first O-ring 11 is embedded in the end face of the main sealing ring 2 close to the interface flange 1. The main sealing structure has excellent anti-corrosion and wear-resistant properties. Installation grooves are cooperatively formed on the side walls of the opposite sides of the outer sleeve 6 and the inner sleeve 9. The installation grooves are also circumferentially arranged. The installation groove on one side of the outer sleeve 6 is circumferentially formed along the inner wall of the outer sleeve 6, and the installation groove on one side of the inner sleeve 9 is circumferentially formed along the outer wall of the inner sleeve 9. And the installation grooves are adapted to the composite sealing structure and the sealing sleeve 3. The composite sealing structure includes a plurality of first sealing gaskets 5 made of polytetrafluoroethylene material and second O-rings 4 made of perfluoroether material. The plurality of first sealing gaskets 5 and the second O-rings 4 are alternately placed in the installation groove, so that a multi-channel sealing structure can be formed between the outer sleeve 6 and the inner sleeve 9. When the main sealing structure fails, effective sealing performance can still be maintained. A sealing platform is circumferentially arranged at one end of the sealing sleeve 3 close to the interface flange 1. When the sealing sleeve 3 is sleeved on the composite sealing structure, its sealing platform is located between the interface flange 1 and the outer sleeve 6 and is pressed by the fastening bolts 13, so that a tight and effective seal is formed among the inner sleeve 9, the outer sleeve 6, and the interface flange 1, preventing medium leakage and greatly improving the sealing performance of the entire swivel joint.

[0024] The relative rotation between the outer sleeve 6 and the inner sleeve 9 is realized by a rotating component arranged between them. A number of circumferentially arranged rotating grooves are cooperatively formed on the side walls of the opposite sides of the outer sleeve 6 and the inner sleeve 9. The number of rotating grooves is located on one side of their mounting grooves and is evenly spaced along the length direction of the inner sleeve 9 or the outer sleeve 6. And a number of ball bearings 8 are arranged in each rotating groove. Thus, the inner sleeve 9 can drive the pipe joint to rotate within the outer sleeve 6. Preferably, 2 rotating grooves are provided. A number of mounting holes corresponding to its rotating grooves are formed on one side wall of the outer sleeve 6 along its length direction. The mounting holes penetrate through the side wall of the outer sleeve 6 and communicate with its rotating grooves. And the mounting holes are adapted to the ball bearings 8 and are provided with plugging bolts 7. By screwing the plugging bolts 7 to open or close the mounting holes, it is convenient to take and place the ball bearings 8 in the rotating grooves. A lubricating oil injection hole is formed through on the other side wall of the outer sleeve 6. The lubricating oil injection hole is located between two adjacent rotating grooves. A straight-through grease cup 12 is arranged on the lubricating oil injection hole. Grease is injected between the inner sleeve 9 and the outer sleeve 6 through the straight-through grease cup 12, making the rotation between the outer sleeve 6 and the inner sleeve 9 smoother.

[0025] A second sealing gasket 14 and a third O-ring 10 are also sleeved on one end of the inner sleeve 9 far away from the interface flange 1. That is, the second sealing gasket 14 and the third O-ring 10 and the composite sealing structure are respectively sleeved on both ends of the inner sleeve 9. The second sealing gasket 14 and the third O-ring 10 are also located between the inner sleeve 9 and the outer sleeve 6, which can effectively prevent the grease injected between the inner sleeve 9 and the outer sleeve 6 from overflowing. Among them, the second sealing gasket 14 is made of polytetrafluoroethylene material, and the third O-ring 10 is made of perfluoroether material.

[0026] The swivel joint of the loading arm of the present utility model resistant to highly corrosive media has a compact overall design structure, small volume, light weight, and flexible rotation. It can work stably for a long time in a highly corrosive environment, and at the same time ensure excellent sealing performance during use to improve its applicability and operation safety in a corrosive medium environment.

[0027] It can be understood that the present utility model is described through some embodiments. Those skilled in the art know that without departing from the spirit and scope of the present utility model, various changes or equivalent replacements can be made to these features and embodiments. In addition, under the teaching of the present utility model, these features and embodiments can be modified to adapt to specific situations and materials without departing from the spirit and scope of the present utility model. Therefore, the present utility model is not limited by the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application belong to the scope protected by the present utility model.

Claims

1. A swivel joint for a loading arm resistant to highly corrosive media, characterized in that: It includes an interface flange (1) and an inner sleeve (9) respectively fixedly sleeved on both sides of the interface of adjacent two pipe sections, an outer sleeve (6) rotatably sleeved on the inner sleeve (9) and connected to the interface flange (1) through a plurality of fastening bolts (13), a main sealing structure located between the interface flange (1) and the inner sleeve (9) and sleeved at the interface of the two pipe sections, and a composite sealing structure located between the outer sleeve (6) and the inner sleeve (9) and sleeved at one end of the inner sleeve (9) close to the interface flange (1). A sealing sleeve (3) is arranged between the composite sealing structure and the outer sleeve (6).

2. The swivel joint of the loading arm resistant to highly corrosive media according to claim 1, wherein: Assembly grooves adapted to the main sealing structure are cooperatively opened on the end faces of the opposite ends of the interface flange (1) and the inner sleeve (9). The main sealing structure includes a main sealing ring (2) closely placed in the assembly groove and an O-ring one (11) embedded in the end face of the main sealing ring (2) close to the interface flange (1).

3. The swivel joint of the loading arm resistant to highly corrosive media according to claim 2, wherein: Installation grooves adapted to the composite sealing structure and the sealing sleeve (3) are cooperatively opened on the side walls of the opposite sides of the outer sleeve (6) and the inner sleeve (9). The composite sealing structure includes a plurality of sealing gaskets one (5) and O-rings two (4) alternately placed in the installation groove.

4. The swivel joint of the loading arm resistant to highly corrosive media according to claim 3, characterized in that: A sealing platform is circumferentially arranged at one end of the sealing sleeve (3) close to the interface flange (1). When it is sleeved on the composite sealing structure, its sealing platform is located between the interface flange (1) and the outer sleeve (6).

5. The swivel joint of the loading arm resistant to highly corrosive media according to claim 4, characterized in that: A plurality of circumferentially arranged rotating grooves are cooperatively opened on the side walls of the opposite sides of the outer sleeve (6) and the inner sleeve (9) on one side of their installation grooves, and each rotating groove is evenly spaced along the length direction of the inner sleeve (9) or the outer sleeve (6). A plurality of balls (8) are arranged in each rotating groove.

6. The swivel joint of the loading arm resistant to highly corrosive media according to claim 5, characterized in that: A plurality of installation holes communicating with its rotating grooves are opened on one side wall of the outer sleeve (6) along its length direction, and the installation holes are adapted to the balls (8) and provided with plugging bolts (7). A grease injection hole located between two adjacent rotating grooves is penetrated and opened on the other side wall, and a straight-through grease cup (12) is arranged on the grease injection hole.

7. A swivel joint for a loading arm resistant to highly corrosive media according to any one of claims 3-6, characterized in that: A sealing gasket two (14) and an O-ring three (10) located between it and the outer sleeve (6) are sleeved at one end of the inner sleeve (9) far from the interface flange (1).

8. The swivel joint of the loading arm resistant to highly corrosive media according to claim 7, characterized in that: The main sealing ring (2) is made of carbon fiber-containing polytetrafluoroethylene material, the sealing sleeve (3), the sealing gasket one (5) and the sealing gasket two (14) are all made of polytetrafluoroethylene material, and the O-ring one (11), the O-ring two (4) and the O-ring three (10) are all made of perfluoroether material.

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