Anti-loosening fastening device for oil pipeline connection

Abstract

The utility model discloses an oil pipeline connection anti-loosening fastening device, which relates to the technical field of fastening devices, and comprises a plurality of fasteners, each fastener comprises a U-shaped plate, and the interface of two pipelines is positioned in the middle area of the U-shaped plate along the axial length of the pipelines; the two ends of the first tightening ring are fixedly connected with the two opposite side faces of the U-shaped plate, the two ends of the second tightening ring are fixedly connected to the two adjacent side faces of the U-shaped plate respectively, and the second tightening ring spans and covers the edge of the outer side of the top of the U-shaped plate. A double-ring cooperative anti-deformation mechanism is adopted, the first tightening ring and the second tightening ring form tightening force in the orthogonal direction, when the pipeline connector is axially separated, the double rings resist expansion of the U-shaped plate in real time through elastic restoring force, and compared with a traditional single-ring structure, the anti-loosening capacity is improved, and the anti-loosening effect is good. And the thicknesses and the widths of the U-shaped plate and the first tightening ring are linearly increased in the radial direction, so that a high-stress area close to the pipeline connector obtains higher supporting rigidity.

Description

Oil pipeline connection anti-loosening fastening device Technical Field

[0001] This utility model relates to the field of fastening device technology, specifically to an anti-loosening fastening device for oil pipeline connections. Background Technology

[0002] As a critical infrastructure for energy transmission, the sealing reliability and structural stability of oil pipelines are of paramount importance. During operation, especially in high-pressure, long-distance transport or geologically fluctuating areas, pipelines are subjected to a variety of complex stresses, including internal fluid pressure fluctuations, temperature changes, mechanical vibrations, and external loads. These stresses can easily lead to slight axial separation displacement at adjacent pipeline connections. Such operating conditions place extremely high demands on the fastening devices at the connection interfaces, requiring them to effectively maintain a tight seal, prevent leaks caused by loose connections, and ensure the long-term safe and efficient operation of the pipeline.

[0003] Currently, existing pipeline connection fastening devices have shortcomings. They typically rely on bolt preload or the clamping force of a single ring structure to maintain the connection. During long-term service, the preload is prone to decrease due to stress relaxation, material creep, or repeated fretting wear, resulting in a reduction in fastening effectiveness. More importantly, when a slight tendency for separation displacement occurs at the pipeline interface, traditional fastening structures often lack effective adaptive suppression mechanisms. They struggle to resist this deformation that leads to interface loosening in real time and effectively, posing a risk of connection failure and leakage. This makes it difficult to meet the high reliability and long service life requirements of modern oil pipelines. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this utility model provides an anti-loosening fastening device for oil pipeline connections.

[0005] To achieve the above objectives, the technical solution of this utility model is as follows:

[0006] Oil pipeline connection anti-loosening fastening device, including

[0007] Several fasteners are evenly distributed in an array along the circumference of the two pipes to be connected and are disposed at the interface between the two pipes.

[0008] Each of the fasteners includes:

[0009] The U-shaped plate has a U-shaped cross-section with an opening facing the outside of the pipe, its inner wall is attached to the outer surface of two adjacent pipes, and the interface of the two pipes is located in the middle region of the U-shaped plate along the axial length of the pipe.

[0010] The first tightening ring has its two ends fixedly connected to the two opposite sides of the U-shaped plate.

[0011] The second tightening ring has its two ends fixedly connected to two adjacent sides of the U-shaped plate, and the second tightening ring spans and covers the outer edge of the top of the U-shaped plate.

[0012] When the two pipes are far apart, the U-shaped plate will be deformed and expanded, and the direction of this deformation is opposite to the direction of the first tightening ring and the second tightening ring tightening inward, thus resisting the deformation and expansion of the U-shaped plate.

[0013] Preferably, the U-shaped plate is installed between two adjacent pipes to be connected by fastening bolts, and the surface of the plate that contacts the pipe is configured as an arc-shaped surface that fits and conforms to the circumferential surface of the pipe.

[0014] Preferably, the width and thickness of the U-shaped plate and the first tightening ring increase linearly along the radial direction of the pipe, gradually becoming thicker and wider from near the pipe axis outwards.

[0015] Preferably, the number of fasteners is set to an even number, and any two fasteners arranged opposite each other are centrally symmetrical about the axis of the pipe.

[0016] Preferably, a fastening ring is connected between the two adjacent ends of the second tightening rings.

[0017] Preferably, a T-shaped shaft is fixed to the surface of the U-shaped plate. The T-shaped shaft includes a vertical section connected to the U-shaped plate and a horizontal section connected to the vertical section. The horizontal section is set as an arc segment coaxial with the pipe. The T-shaped shafts on adjacent U-shaped plates are fixedly connected by fastening bolts.

[0018] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0019] 1. This utility model adopts a dual-ring synergistic anti-deformation mechanism. The first tightening ring and the second tightening ring form a tightening force in an orthogonal direction. When the pipe interface separates axially, the dual rings resist the expansion of the U-shaped plate in real time through elastic restoring force. Compared with the traditional single ring structure, the anti-loosening ability is improved.

[0020] 2. The thickness and width of the U-shaped plate and the first tightening ring of this utility model increase linearly in the radial direction, so that the high stress area near the pipe interface can obtain stronger support rigidity.

[0021] 3. This utility model uses an even number of fasteners symmetrically distributed and connected by a T-shaped shaft to form a ring frame, so that the local force is evenly transmitted to the overall structure, thereby improving the torsional stiffness of the device and maintaining the sealing performance of the interface when the pipeline undergoes corner deformation. Attached Figure Description

[0022] The disclosure of this utility model is illustrated with reference to the accompanying drawings. It should be understood that the drawings are for illustrative purposes only and are not intended to limit the scope of protection of this utility model. In the drawings, the same reference numerals are used to refer to the same parts. Wherein:

[0023] Figure 1 is a structural schematic diagram of the anti-loosening fastening device for oil pipeline connection of this utility model;

[0024] Figure 2 is a structural schematic diagram of the fastener of this utility model;

[0025] Figure 3 is a schematic diagram of the cross-sectional structure of the fastener of this utility model.

[0026] The diagram shows the following labels: 1. Fastener; 2. U-shaped plate; 3. First tightening ring; 4. Second tightening ring; 5. Fastening ring; 6. T-shaped shaft. Detailed Implementation

[0027] It is readily understood that, based on the technical solution of this utility model, those skilled in the art can propose various interchangeable structural methods and implementations without altering the essential spirit of this utility model. Therefore, the following detailed embodiments and accompanying drawings are merely illustrative descriptions of the technical solution of this utility model and should not be considered as the entirety of this utility model or as limitations or restrictions on the technical solution of this utility model.

[0028] Example

[0029] As shown in Figure 1, the oil pipeline connection anti-loosening fastening device includes several fasteners 1, which are evenly distributed in an array along the circumference of the two pipelines to be connected and are set at the interface between the two pipelines.

[0030] The number of fasteners 1 is set to an even number, preferably 6 or 8, and they are distributed at equal intervals of 60° or 45° along the circumference of the pipe to be connected. They are fixed to the flange or the outside of the straight pipe section at the pipe interface by bolts.

[0031] Any two fasteners 1 set opposite each other are centrally symmetrically distributed around the axis of the pipe. The symmetrical distribution design can ensure uniform circumferential force and avoid fastening failure caused by local stress concentration.

[0032] Preferably, as shown in Figures 2-3, each fastener 1 includes:

[0033] U-shaped plate 2, U-shaped plate 2 has a U-shaped cross section with the opening facing the outside of the pipe, its inner wall is attached to the outer surface of two adjacent pipes, and the interface of the two pipes is located in the middle region of the U-shaped plate 2 along the axial length of the pipe;

[0034] The U-shaped plate 2 is installed between two adjacent pipes to be connected by fastening bolts. The surface of the U-shaped plate 2 that contacts the pipe is configured as an arc-shaped surface that fits and conforms to the circumferential side of the pipe. The inner wall surface of the U-shaped plate 2 that contacts the pipe adopts an arc-shaped curved surface that matches the outer diameter of the pipe. It is machined by CNC lathe to ensure that the fit with the outer surface of the pipe is ≥95%, reducing vibration and wear caused by installation gaps.

[0035] The first tightening ring 3 is fixedly connected to the two opposite sides of the U-shaped plate 2 at both ends. The first tightening ring 3 is made of 65Mn spring steel. The two ends are fixed to the opposite sides of the U-shaped plate 2 by welding to form a horizontal tightening force. When the pipe interface separates axially, the first tightening ring 3 resists the expansion of the U-shaped plate 2 through elastic restoring force.

[0036] The second tightening ring 4 has its two ends fixedly connected to the two adjacent sides of the U-shaped plate 2, and the second tightening ring 4 spans and covers the outer edge of the top of the U-shaped plate 2. The second tightening ring 4 is made of 304 stainless steel, and its two ends are welded to the adjacent sides of the U-shaped plate 2. When it spans the top edge of the U-shaped plate 2, it forms a 120° coverage angle.

[0037] A fastening ring 5 is connected between the near ends of the two second tightening rings 4. The second tightening rings 4 cooperate with the fastening ring 5 to connect the near ends of the two second tightening rings 4, forming a three-dimensional tightening structure.

[0038] Preferably, as shown in Figures 2-3, the width and thickness of the U-shaped plate 2 and the first tightening ring 3 increase linearly along the radial direction of the pipe, gradually becoming thicker and wider from near the pipe axis outwards. This design allows the area near the pipe interface to have higher bending strength and resist expansion deformation caused by internal fluid pressure.

[0039] Preferably, as shown in Figure 3, a T-shaped shaft 6 is fixed on the surface of the U-shaped plate 2. The T-shaped shaft 6 includes a vertical section connected to the U-shaped plate 2 and a horizontal section connected to the vertical section. The horizontal section is set as an arc section coaxial with the pipe. The T-shaped shafts 6 on two adjacent U-shaped plates 2 are fixedly connected by fastening bolts.

[0040] The horizontal section of the T-shaped shaft 6 is an arc-shaped stainless steel section with a curvature coaxial with the pipe. The T-shaped shafts 6 on adjacent U-shaped plates 2 are connected by M10 bolts to form a ring support frame. This structure can transfer the force of a single fastener 1 to the entire array, improving the torsional stiffness of the device.

[0041] This device has an anti-loosening mechanism: when the pipeline tends to separate axially due to internal pressure or external vibration, the U-shaped plate 2 expands outward under tensile stress. At this time, the first tightening ring 3 and the second tightening ring 4 generate inward tightening force due to elastic deformation. The direction of the two is opposite to the expansion direction of the U-shaped plate 2, forming a dynamic balance and inhibiting the further development of deformation.

[0042] The technical scope of this utility model is not limited to the content described above. Those skilled in the art can make various modifications and variations to the above embodiments without departing from the technical concept of this utility model, and all such modifications and variations should fall within the protection scope of this utility model.

Claims

1. An anti-loosening fastening device for oil pipeline connections, characterized in that: The device includes several fasteners (1), which are evenly distributed in an array along the circumference of the two pipes to be connected and are located at the interface between the two pipes. Each fastener (1) includes: a U-shaped plate (2), which has a U-shaped cross section with the opening facing the outside of the pipe, its inner wall is attached to the outer surface of the two adjacent pipes, and the interface of the two pipes is located in the middle region of the U-shaped plate (2) along the axial length of the pipe; a first tightening ring (3), which is fixedly connected at both ends to the two opposite sides of the U-shaped plate (2); and a second tightening ring (4), which is fixedly connected at both ends to the two adjacent sides of the U-shaped plate (2), and the second tightening ring (4) spans and covers the edge of the top outer side of the U-shaped plate (2). When the two pipes move away from each other, the U-shaped plate (2) will be deformed and expanded, and the direction of deformation is opposite to the direction of the first tightening ring (3) and the second tightening ring (4) tightening inward, thus resisting the deformation and expansion of the U-shaped plate (2).

2. The oil pipeline connection anti-loosening fastening device according to claim 1, characterized in that: The U-shaped plate (2) is installed between two adjacent pipes to be connected by fastening bolts, and the surface of the plate that contacts the pipe is configured as an arc-shaped surface that fits and conforms to the circumferential surface of the pipe.

3. The oil pipeline connection anti-loosening fastening device according to claim 2, characterized in that: The width and thickness of the U-shaped plate (2) and the first tightening ring (3) increase linearly along the radial direction of the pipe, gradually becoming thicker and wider from near the pipe axis outwards.

4. The oil pipeline connection anti-loosening fastening device according to claim 3, characterized in that: The number of fasteners (1) is set to an even number, and any two fasteners (1) arranged opposite each other are centrally symmetrically distributed with respect to the axis of the pipe.

5. The oil pipeline connection anti-loosening fastening device according to claim 4, characterized in that: A fastening ring (5) is connected between the two adjacent ends of the second tightening rings (4).

6. The oil pipeline connection anti-loosening fastening device according to claim 5, characterized in that: The surface of the U-shaped plate (2) is fixed with a T-shaped shaft (6). The T-shaped shaft (6) includes a vertical section connected to the U-shaped plate (2) and a horizontal section connected to the vertical section. The horizontal section is set as an arc section coaxial with the pipe. The T-shaped shafts (6) on two adjacent U-shaped plates (2) are fixedly connected by fastening bolts.

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