Fatigue-resistant stainless steel pipe for oil transportation

Abstract

This utility model relates to the field of stainless steel pipe design and discloses a fatigue-resistant stainless steel pipe for oil transportation, including connecting flanges. Each of the two connecting flanges contains a stainless steel pipe body. Two pre-set fixing plates are fixedly connected to the left side of the left connecting flange, and two limiting adjustment rings are provided on the right side of the right connecting flange. The pre-set fixing plates are connected to the limiting adjustment rings via connecting components. A reserved insertion groove is provided inside the left connecting flange, and a clamping component is provided inside the reserved insertion groove. A sealing rubber ring is fixedly connected to the left side of the right connecting flange, and the outer wall of the sealing rubber ring is slidably connected to the inner wall of the reserved insertion groove. This utility model avoids misalignment during connection, achieving a stable connection between the two stainless steel pipes. It is suitable for complex oil transportation conditions such as high pressure and high-frequency vibration, ensuring continuous contact between the rubber ring and the contact surface, effectively preventing leakage of the oil transportation medium, and guaranteeing the sealing performance and safety of the oil transportation process.

Description

Technical Field

[0001] This utility model relates to the field of stainless steel pipe design, and in particular to a fatigue-resistant stainless steel pipe for oil transportation. Background Technology

[0002] In the fields of oil extraction, transportation, and refining, oil pipelines serve as the core carriers for medium transmission. They must withstand complex operating conditions such as high pressure, high-frequency vibration, and oil corrosion over long periods. The stability and sealing performance of their connections directly affect oil transportation efficiency and safe production. Due to their excellent corrosion resistance and mechanical properties, stainless steel pipes have become a key component of oil transportation systems. Especially in long-distance, high-pressure oil transportation scenarios, extremely high requirements are placed on the fatigue resistance, connection reliability, and sealing durability of stainless steel pipes.

[0003] Pipeline connections often employ traditional bolt-fixed flange structures. These bolts are prone to loosening due to high-frequency vibrations during oil transportation, leading to flange misalignment. This not only affects the overall stability of the pipeline but may also introduce leakage risks. Furthermore, the lack of anti-rotation positioning structures during bolt installation makes threaded misalignment more likely, further reducing connection accuracy. Sealing structures are typically rigid fit designs without elastic compensation mechanisms. When the pipeline experiences thermal expansion and contraction due to temperature changes or vibration, the sealing ring can easily detach from the flange contact surface, causing oil leakage. In addition, traditional connection methods involve complex assembly processes, requiring multiple adjustments to bolt tightening force, resulting in low efficiency and making them unsuitable for complex oil transportation conditions such as high pressure and high-frequency vibration.

[0004] In response to this technical problem, this application proposes a fatigue-resistant stainless steel pipe for oil transportation. Utility Model Content

[0005] The purpose of this invention is to address the shortcomings of existing technologies by proposing a fatigue-resistant stainless steel pipe for oil transportation. This pipe avoids misalignment during connection, achieves a stable connection between two stainless steel pipes, is suitable for complex oil transportation conditions such as high pressure and high frequency vibration, ensures continuous contact between the rubber ring and the contact surface, effectively prevents leakage of the oil transportation medium, and guarantees the sealing and safety of the oil transportation process.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] A fatigue-resistant stainless steel pipe for oil transportation includes connecting flanges. Each connecting flange contains a stainless steel pipe body. Two pre-set fixing plates are fixedly connected to the left side of the left connecting flange, and two limit adjustment rings are provided on the right side of the right connecting flange. The pre-set fixing plates are connected to the limit adjustment rings via connecting components. A reserved insertion groove is provided inside the left connecting flange, and a clamping component is provided inside the reserved insertion groove. A sealing ring is fixedly connected to the left side of the right connecting flange, and the outer wall of the sealing ring is slidably connected to the inner wall of the reserved insertion groove.

[0008] Furthermore, the connecting assembly includes an adjusting slide rod that is slidably connected to the interior of the two connecting flanges. The rear ends of the two adjusting slide rods are threaded with adjusting screw caps. The outer walls of the two adjusting slide rods are fixedly connected with preset limiting slide bars. The front ends of the two adjusting slide rods are fixedly connected with preset limiting blocks.

[0009] Furthermore, the outer wall of the preset limiting slide is slidably connected to the inside of the connecting flange, and the left and right ends of the two limiting adjustment rings are provided with reserved through grooves, and the top and bottom ends of the two limiting adjustment rings are provided with reserved semi-through grooves.

[0010] Furthermore, the clamping assembly includes a preset connecting pressure plate that is slidably connected to the inside of the reserved insertion slot, and a clamping spring is provided inside the connecting flange at the left end.

[0011] Furthermore, one end of the compression spring is connected to the inside of the reserved insertion slot, and the other end is connected to the left side of the preset connecting pressure plate.

[0012] Furthermore, both ends of the two connecting flanges are provided with reserved connecting holes, and the outer wall of the adjusting slide rod is slidably connected to the inner wall of the reserved connecting hole.

[0013] Furthermore, the right sides of both adjusting screw caps are rotatably connected to the left side of the preset fixing plate.

[0014] This utility model has the following beneficial effects:

[0015] 1. In this utility model, the connecting flange is the core. An adjusting slide rod passes through the corresponding pre-drilled connection hole. A preset limiting slide bar prevents the slide rod from rotating or shifting. The misalignment of the limiting adjusting ring and the preset limiting block further restricts the axial disengagement of the slide rod. Finally, tightening the adjusting screw cap pulls the slide rod to bring the two flanges closer together for secure fastening. The entire transmission process is stable, preventing misalignment and achieving a stable connection between the two stainless steel pipes. This design is suitable for complex oil transportation conditions such as high pressure and high-frequency vibration.

[0016] 2. In this utility model, during flange connection, the sealing ring squeezes the pre-set connecting pressure plate and compresses the clamping spring. The spring's reaction force pushes the pressure plate to tightly press the sealing ring against the contact surface, forming an elastic seal. Even if the pipeline vibrates or expands and contracts due to thermal expansion and contraction, the spring can compensate for displacement through deformation, ensuring that the sealing ring and the contact surface remain in contact, effectively preventing leakage of the oil medium and ensuring the sealing performance and safety of the oil transportation process. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of a fatigue-resistant stainless steel pipe for oil transportation proposed in this utility model.

[0018] Figure 2 This is a schematic diagram of the connection mechanism of a fatigue-resistant stainless steel pipe for oil transportation proposed in this utility model;

[0019] Figure 3 This is a schematic diagram of the sealing structure of a fatigue-resistant stainless steel pipe for oil transportation proposed in this utility model.

[0020] Legend:

[0021] 1. Connecting flange; 2. Stainless steel pipe body; 3. Pre-set fixing plate; 4. Adjusting screw cap; 5. Adjusting slide bar; 6. Pre-set limit slide bar; 7. Pre-set limit block; 8. Reserved semi-through groove; 9. Reserved through groove; 10. Limit adjustment ring; 11. Compression spring; 12. Pre-set connecting pressure plate; 13. Reserved insertion groove; 14. Sealing ring; 15. Reserved connection hole. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0023] Reference Figure 1 This utility model provides an embodiment of a fatigue-resistant stainless steel pipe for oil transportation, comprising connecting flanges 1, each containing a stainless steel pipe body 2. Two pre-set fixing plates 3 are fixedly connected to the left side of the left connecting flange 1, and two limiting adjustment rings 10 are provided on the right side of the right connecting flange 1. The pre-set fixing plates 3 are connected to the limiting adjustment rings 10 via adjusting slide rods 5. A pre-reserved insertion groove 13 is provided inside the left connecting flange 1, and a pre-set connecting pressure plate 12 is slidably connected inside the pre-reserved insertion groove 13. A sealing ring 14 is fixedly connected to the left side of the right connecting flange 1, and the outer wall of the sealing ring 14 is slidably connected to the inner wall of the pre-reserved insertion groove 13. Pre-reserved connection holes 15 are provided at both ends of the two connecting flanges 1, and the outer wall of the adjusting slide rod 5 is slidably connected to the inner wall of the pre-reserved connection hole 15. The right sides of two adjusting screw caps 4 are rotatably connected to the left side of the pre-set fixing plates 3.

[0024] Specifically, the stainless steel pipe uses the connecting flange 1 as the core connection structure. When the two stainless steel pipe bodies 2 need to be connected, the initial positioning is first performed: the sealing ring 14 on the left side of the right connecting flange 1 is aligned with the reserved insertion groove 13 on the left connecting flange 1 and inserted, so that the two flanges are precisely aligned.

[0025] Reference Figure 2Two connecting flanges 1 are internally connected to adjusting slide rods 5, and the rear ends of both adjusting slide rods 5 are threaded with adjusting screw caps 4. Preset limiting slide bars 6 are fixedly connected to the outer walls of both adjusting slide rods 5, and preset limiting blocks 7 are fixedly connected to the front ends of both adjusting slide rods 5. The outer walls of the preset limiting slide bars 6 are slidably connected to the interior of the connecting flanges 1. Both ends of the two limiting adjusting rings 10 have reserved through grooves 9, and the top and bottom ends of the two limiting adjusting rings 10 have reserved semi-through grooves 8.

[0026] Specifically, the adjusting slide rod 5 is passed through the reserved connection holes 15 at corresponding positions of the two connecting flanges 1. During this process, the preset limiting slide strip 6 on the outer wall of the adjusting slide rod 5 slides along the inner wall of the reserved connection hole 15, which can effectively prevent the adjusting slide rod 5 from rotating and deviating. After the preset limiting block 7 at the front end of the adjusting slide rod 5 passes through the right end connecting flange 1, the limiting adjusting ring 10 is rotated so that the adjusting slide rod 5 and the preset limiting block 7 pass through the reserved through groove 9 of the limiting adjusting ring 10 respectively. Then, the limiting adjusting ring 10 is rotated to a preset angle so that the preset limiting block 7 and the reserved semi-through groove 8 are misaligned. The blocking effect of the limiting adjusting ring 10 on the preset limiting block 7 restricts the axial disengagement of the adjusting slide rod 5. Finally, rotate the adjusting screw cap 4. Since the adjusting screw cap 4 is threadedly connected to the adjusting slide rod 5 and its right side is rotatably connected to the preset fixing plate 3, the adjusting slide rod 5 can be pulled to the left during the tightening process, thereby driving the two connecting flanges 1 to move closer to each other and completing the initial tightening. During this process, the preset limit slide bar 6 continuously restricts the rotation of the adjusting slide rod 5 to ensure the stability of the threaded transmission and the firmness of the flange connection.

[0027] Reference Figure 3 A pre-set connecting pressure plate 12 is slidably connected inside the reserved insertion slot 13, and a compression spring 11 is provided inside the left end connecting flange 1. One end of the compression spring 11 is connected to the inside of the reserved insertion slot 13, and the other end is connected to the left side of the pre-set connecting pressure plate 12.

[0028] Specifically, when the two flanges approach each other, the sealing ring 14 of the right-end connecting flange 1 presses against the preset connecting plate 12 at the left end within the reserved insertion groove 13, causing the preset connecting plate 12 to slide to the left and compress the compression spring 11. The reaction force generated by the compression spring 11 pushes the preset connecting plate 12 back to the right, always keeping the sealing ring 14 tightly pressed between the inner wall of the reserved insertion groove 13 and the right-end flange, forming an elastic sealing structure. Even when the pipeline encounters vibration or thermal expansion and contraction due to temperature changes, the compression spring 11 can compensate for the displacement through its own deformation, ensuring that the sealing ring 14 remains in contact with the contact surface, effectively preventing leakage of the oil medium and ensuring the sealing performance and safety of the oil transportation process.

[0029] Working principle: The fatigue-resistant stainless steel pipe for oil transportation uses the connecting flange 1 as the core connection structure. The two stainless steel pipe bodies 2 are stably connected through the connecting components. At the same time, the sealing performance of the oil transportation process is ensured by the clamping components and the sealing ring 14. It is suitable for complex oil transportation conditions such as high pressure and high frequency vibration.

[0030] During the pipe connection stage, firstly, align the sealing ring 14 on the left side of the right-end connecting flange 1 with the reserved insertion slot 13 of the left-end connecting flange 1 and insert it to initially position the two flanges. Then, the flanges are fixed using the connecting assembly: the adjusting slide rod 5 is passed through the reserved connection holes 15 at corresponding positions on the two connecting flanges 1. During this process, the preset limiting slide strip 6 on the outer wall of the adjusting slide rod 5 slides along the inner wall of the reserved connection hole 15 to prevent the adjusting slide rod 5 from rotating or shifting. After the preset limiting block 7 at the front end of the adjusting slide rod 5 passes through the right-end connecting flange 1, rotate the limiting adjusting ring 10 so that the adjusting slide rod 5 and the preset limiting block 7 pass through the reserved through slot 9 of the limiting adjusting ring 10 respectively. Then, rotate the limiting adjusting ring 10 to a preset angle, causing the preset limiting block 7 to misalign with the reserved semi-through slot 8. The limiting adjusting ring 10's blocking effect on the preset limiting block 7 prevents the adjusting slide rod 5 from axially disengaging. Finally, rotate the adjusting screw cap 4. Since it is threadedly connected to the adjusting slide rod 5 and rotates to the right side of the preset fixing plate 3, the adjusting slide rod 5 can be pulled to the left during the tightening process, which will drive the two connecting flanges 1 to move closer to each other and complete the initial tightening. At the same time, the preset limit slide bar 6 continuously restricts the rotation of the adjusting slide rod 5 to ensure the stability of the threaded transmission.

[0031] In the sealing process, when the two flanges approach each other, the sealing ring 14 of the right-end connecting flange 1 presses against the preset connecting plate 12 on the left end within the reserved insertion groove 13, causing the preset connecting plate 12 to slide to the left and compress the compression spring 11. The reaction force generated by the compression spring 11 pushes the preset connecting plate 12 back to the right, always keeping the sealing ring 14 tightly pressed between the inner wall of the reserved insertion groove 13 and the right-end flange, forming an elastic sealing structure. Even during pipeline vibration or thermal expansion and contraction, the compression spring 11 can compensate for displacement through deformation, ensuring that the sealing ring 14 remains in contact with the contact surface and preventing leakage of the oil medium.

[0032] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A fatigue-resistant stainless steel pipe for oil transportation, comprising a connecting flange (1), characterized in that: Both connecting flanges (1) are equipped with stainless steel pipe bodies (2). The left connecting flange (1) has two preset fixing plates (3) fixedly connected to the left side. The right connecting flange (1) has two limit adjustment rings (10) on the right side. The preset fixing plates (3) are connected to the limit adjustment rings (10) through connecting components. The left connecting flange (1) has a reserved insertion groove (13) inside. The reserved insertion groove (13) has a pressing component inside. The right connecting flange (1) has a sealing ring (14) fixedly connected to the left side. The outer wall of the sealing ring (14) is slidably connected to the inner wall of the reserved insertion groove (13).

2. The fatigue-resistant stainless steel pipe for oil transportation according to claim 1, characterized in that: The connecting assembly includes an adjusting slide rod (5) that is slidably connected to the inside of the two connecting flanges (1). The rear ends of the two adjusting slide rods (5) are threaded with adjusting screw caps (4). The outer walls of the two adjusting slide rods (5) are fixedly connected with preset limiting slide strips (6). The front ends of the two adjusting slide rods (5) are fixedly connected with preset limiting blocks (7).

3. The fatigue-resistant stainless steel pipe for oil transportation according to claim 2, characterized in that: The outer wall of the preset limiting slide bar (6) is slidably connected to the inside of the connecting flange (1). The left and right ends of the two limiting adjustment rings (10) are provided with reserved through grooves (9), and the top and bottom ends of the two limiting adjustment rings (10) are provided with reserved semi-through grooves (8).

4. The fatigue-resistant stainless steel pipe for oil transportation according to claim 1, characterized in that: The clamping assembly includes a preset connecting plate (12) that is slidably connected to the inside of the reserved insertion slot (13), and a clamping spring (11) is provided inside the connecting flange (1) at the left end.

5. The fatigue-resistant stainless steel pipe for oil transportation according to claim 4, characterized in that: One end of the compression spring (11) is connected to the inside of the reserved insertion slot (13), and the other end is connected to the left side of the preset connecting pressure plate (12).

6. The fatigue-resistant stainless steel pipe for oil transportation according to claim 2, characterized in that: Both ends of the two connecting flanges (1) are provided with reserved connecting holes (15), and the outer wall of the adjusting slide rod (5) is slidably connected to the inner wall of the reserved connecting hole (15).

7. The fatigue-resistant stainless steel pipe for oil transportation according to claim 2, characterized in that: The right sides of both adjusting screw caps (4) are rotatably connected to the left side of the preset fixing plate (3).

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