Double-inlet and double-outlet oil transportation rotary joint for single-point mooring

Abstract

The utility model provides a double-inlet and double-outlet oil transportation rotary joint for single-point mooring, which comprises an oil inlet cavity, an oil outlet cavity, a fixed arc plate, a sand-proof seal, a movable seal I, a movable seal II, a three-row roller bearing, a waterproof seal, a leakage dynamic detector and a driving arm, the lower portion of the oil outlet cavity is connected with a subsea pipeline. A sand-proof seal, a first dynamic seal, a second dynamic seal and a waterproof seal are arranged at the joint of the oil inlet cavity and the oil outlet cavity, and a fixed arc plate is connected with the oil outlet cavity and the single-point mooring buoy steel structure. An oil leakage hole is formed in the position, connected with the oil inlet cavity, of the oil outlet cavity, and a hard pipe for dynamic leakage detection is connected with the oil leakage hole; the driving arm is connected with the oil inlet cavity and installed on the single-point mooring buoy steel structure. Through the double-channel design, the four-layer sealing design and the leakage dynamic detection design, the problem of offshore oil dynamic sealing conveying can be solved.

Description

Technical Field

[0001] The utility model relates to the technical field of rotary joints, in particular to a double-inlet and double-outlet oil transfer rotary joint for single-point mooring. Background Art

[0002] Single-point mooring (SPM) involves mooring an offshore vessel to a fixed or floating structure at a single point. The vessel can rotate 360° around the structure in response to wind, waves, and currents. Due to the weathervane effect, the moored vessel is anchored in the direction with the least environmental forces. Single-point mooring systems are commonly used in offshore oilfield development operations and crude oil loading and unloading terminals that replace fixed piers. The oil transfer rotary joint is the core and most critical component of this single-point mooring system. Its function is to ensure that oil unloaded from the tanker is safely transferred to the submarine pipeline through the rotating section through a reliable rotary dynamic seal, thus achieving the weathervane effect.

[0003] Existing single-point mooring rotary joints use a cast steel stacking structure to achieve dual-channel fluid transportation, which is heavy, costly, has a complex sealing structure that is difficult to maintain, a small fluid transportation diameter, and low working efficiency.

[0004] Therefore, it is necessary to provide a new type of rotary joint to solve the existing problems. This utility model proposes a dual-inlet, dual-outlet oil transfer rotary joint for single-point mooring. This joint utilizes a multi-pipeline welded structure, is lightweight, and features a sealing structure concentrated on concentric circles at the interface of the upper and lower rotating cavities. This facilitates maintenance and replacement, is suitable for large-diameter fluid transportation, and offers high efficiency. This utility model ensures dynamic, leak-free, and highly efficient crude oil transportation during the rotation of the rotary structure, ultimately enabling rapid, large-diameter, dual-channel crude oil transportation. Utility Model Content

[0005] In response to the technical problems raised above, a dual-inlet and dual-outlet oil transfer rotary joint for single-point mooring is provided. This utility model mainly solves the problem of dynamic sealing of offshore oil transportation through a dual-channel design, a four-layer sealing design, and a dynamic leakage detection design. The technical means adopted by this utility model are as follows:

[0006] A double-inlet, double-outlet oil transfer rotary joint for single-point mooring, comprising: an oil inlet cavity, an oil outlet cavity, a fixed arc plate, a sand-proof seal, a first dynamic seal, a second dynamic seal, three rows of roller bearings, a waterproof seal, a dynamic leakage detector, and a drive arm. The upper portion of the oil inlet cavity is connected to the oil tanker pipeline, and the lower portion is rotationally connected to the oil outlet cavity via three rows of roller bearings. The lower portion of the oil outlet cavity is connected to the submarine pipeline.

[0007] The connection between the oil inlet cavity and the oil outlet cavity is provided with a sand-proof seal, a dynamic seal 1, a dynamic seal 2 and a waterproof seal from the inside to the outside. The sand-proof seal, the dynamic seal 1 and the dynamic seal 2 are located on the inner side of the three-row roller bearing, and the waterproof seal is located on the outer side of the three-row roller bearing.

[0008] The upper portion of the fixed circular plate is connected to the oil outlet cavity, and the lower portion is connected to the steel structure of the single-point mooring buoy; an oil leakage hole is opened on the oil outlet cavity at the position connected to the oil inlet cavity, and the oil leakage hole is located between the dynamic seal 1 and the dynamic seal 2. The dynamic leakage detection device is installed on the fixed circular plate and includes a hard pipe, which is inserted into the oil outlet cavity and connected to the oil leakage hole;

[0009] One side of the driving arm is connected to the oil inlet cavity, and the other side is installed on the single-point mooring buoy steel structure.

[0010] Furthermore, the oil inlet cavity includes a dome and a main passage straight pipe, the dome is welded to the top of the main passage straight pipe, the main passage straight pipe has openings on both sides, and short straight pipes are inserted into the openings. An inlet flange is welded on each of the short straight pipes, and the inlet flange is connected to the flange of the oil tanker pipeline.

[0011] Furthermore, a bearing mounting flange is welded to the bottom of the main passage straight pipe, and a bearing groove for placing three rows of roller bearings is processed inside the bearing mounting flange. The bearing mounting flange is connected to the inner ring of the three rows of roller bearings by bolts, and a lower main flange is welded to the upper part of the oil outlet cavity, and the lower main flange is connected to the outer ring of the three rows of roller bearings by bolts.

[0012] Furthermore, a wear-resistant ring is welded on the lower part of the bearing mounting flange, and the wear-resistant ring is located at the sand-proof seal.

[0013] Furthermore, the lower main flange is processed with a sand-proof sealing groove, a dynamic seal 1 sealing groove, a dynamic seal 2 sealing groove, a bearing mounting groove, and a seawater-proof dynamic sealing groove in sequence along the radial direction. From the center of the cavity to the outside, the sand-proof seal, dynamic seal 1, dynamic seal 2, three rows of roller bearings, and waterproof seal are installed in sequence.

[0014] Furthermore, ear plates are welded on both sides of the lower portion of the main passage straight pipe, and the ear plates are hinged to the driving arm.

[0015] Furthermore, the dynamic seal 1, dynamic seal 2 and waterproof seal all use spring energy storage sealing rings.

[0016] Furthermore, two 45° elbows are welded and extended from the left and right sides of the lower part of the oil outlet cavity, an outlet flange is welded at the end of each 45° elbow, and a spherical crown is welded at the bottom of the oil outlet cavity.

[0017] Furthermore, the dynamic leakage detection also includes a double ball valve and a collecting tank located outside the oil outlet cavity, the double ball valve is installed on the hard pipe, the collecting tank is connected to the hard pipe, a liquid level gauge is installed on the outside of the collecting tank, an explosion-proof valve is installed on the upper part, an oil drain valve is installed on the lower part, and the bottom is installed on a fixed arc plate.

[0018] Furthermore, the driving arm includes two herringbone legs and a steel plate. One end of the two herringbone legs is hinged to the ear plates on both sides of the oil inlet cavity through a pin shaft, and the other end is welded to the steel plate. The steel plate is connected to a support fixed on the steel structure of the single-point mooring buoy and can slide in the middle hole of the support.

[0019] Compared with the prior art, the utility model has the following advantages:

[0020] 1. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring provided by the utility model adopts a multi-pipeline welded structure, is light in weight, and the sealing structure is concentrated on the concentric circles of the interface between the upper and lower rotating cavities, which is easy to maintain and replace, suitable for large-caliber fluid transportation, and has high work efficiency.

[0021] 2. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring provided by the utility model adopts a concentric circle design for sand-proof seal, active seal, secondary dynamic seal and waterproof seal. When replacing the sealing ring, it is only necessary to lift the upper fixed cavity a certain distance to remove the sealing ring, which reduces the working space and improves the replacement efficiency.

[0022] 3. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring provided by the utility model adopts spring-energy storage sealing rings for dynamic seal 1, dynamic seal 2 and waterproof seal, and achieves sealing by pressing the sliding surface.

[0023] 4. The dual-inlet, dual-outlet oil transfer rotary joint for single-point mooring provided by this utility model features dynamic leakage detection. The oil leak hole located between dynamic seals 1 and 2 connects to a hard pipe, a double ball valve, and ultimately flows to a collection tank with a level alarm. This provides timely warning of crude oil leaks, reducing environmental pollution.

[0024] Based on the above reasons, the utility model can be widely promoted in the fields of single point mooring systems and the like. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1The utility model is a schematic diagram of a double-inlet and double-outlet oil transfer rotary joint for single-point mooring.

[0027] Figure 2 for Figure 1 Enlarged view of point I in the middle.

[0028] Figure 3 for Figure 1 Center A view.

[0029] Figure: 1. Oil inlet chamber; 2. Oil outlet chamber; 3. Fixed arc plate; 4. Anti-sand seal; 5. Dynamic seal 1; 6. Dynamic seal 2; 7. Three-row roller bearing; 8. Waterproof seal; 9. Dynamic leakage detection; 10. Drive arm.

[0030] 1.1. Dome; 1.2. Main passage straight pipe; 1.3. Short straight pipe; 1.4. Inlet flange; 1.5. Ear plate; 1.6. Bearing mounting flange; 1.7. Wear ring;

[0031] 2.1. Lower main flange; 2.2. Sand-proof sealing groove; 2.3. Dynamic seal 1 sealing groove; 2.4. Dynamic seal 2 sealing groove; 2.5. Bearing mounting slot; 2.6. Waterproof sealing groove; 2.7. 45° elbow; 2.8. Outlet flange; 2.9. Spherical crown;

[0032] 9.1. Oil leakage hole; 9.2. Hard pipe; 9.3. Double ball valve; 9.4. Collection tank; 9.5. Explosion-proof valve; 9.6. Liquid level gauge; 9.7. Oil drain valve;

[0033] 10.1. Herringbone support leg; 10.2. Steel plate; 10.3. Support; 10.4. Pin. DETAILED DESCRIPTION

[0034] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] This utility model provides a dual-inlet and dual-outlet oil transfer rotary joint for single-point mooring, which relates to the field of marine engineering machinery design, particularly the field of single-point mooring system design. Through a dual-channel design, a four-layer sealing design, and a dynamic leakage detection design, this utility model solves the problem of dynamic sealing of offshore oil transportation.

[0036] This utility model features a dual-inlet, dual-outlet oil transfer rotary joint for single-point mooring. It is installed on a buoy-type single-point mooring system. Its lower outlet connects to a submarine pipeline, while its upper inlet connects to an oil tanker pipeline. It ensures sealed transmission of fluids at a specific temperature, pressure, and flow rate while the vessel rotates 360 degrees around the single-point mooring system, preventing oil leaks. This joint utilizes a lifting lug at the head of the upper rotary chamber (the oil inlet chamber), an online replacement device at the lower section, and a rotary support and sealing system design at the oil outlet chamber. This design not only ensures continuous, leak-free fluid transfer relative to the rotary chamber, but also allows for rapid replacement in the event of seal failure.

[0037] The utility model is a double-inlet and double-outlet oil transfer rotary joint for single-point mooring. It mainly consists of an oil inlet cavity 1, an oil outlet cavity 2, a fixed arc plate 3, a sand-proof seal 4, a dynamic seal 1 5, a dynamic seal 2 6, a three-row roller bearing 7, a waterproof seal 8, a dynamic leakage detection 9, a drive arm 10, etc. Figure 1 .

[0038] The upper portion of the oil inlet chamber 1 is welded to the main passageway straight pipe 1.2 using a dome 1.1. Short straight pipes 1.3 are inserted through holes on either side of the main passageway straight pipe 1.2. Inlet flanges 1.4 are welded to each short straight pipe 1.3, which in turn connect to the flanges of the oil tanker pipeline. Lugs 1.5 are welded to the lower portion of the main passageway straight pipe 1.2, articulating them with hinges on either side of the drive arm 10. A bearing mounting flange 1.6 is welded to the bottom of the main passageway straight pipe 1.2. Bearing grooves for three rows of roller bearings 7 are machined inside the flanges, and a wear ring 1.7 is welded to the lower portion.

[0039] The oil outlet cavity 2 is a welded structure, with a lower main flange 2.1 welded to its upper portion. Radially along this flange are a sand-proof seal groove 2.2, a dynamic seal 1 groove 2.3, a dynamic seal 2 groove 2.4, a bearing mounting slot 2.5, and a water-proof dynamic seal groove 2.6. Installed from the center of the cavity outward are a sand-proof seal 4, a dynamic seal 1 5, a dynamic seal 2 6, a three-row roller bearing 7, and a waterproof seal 8. The sand-proof seal 4, dynamic seal 1 5, and dynamic seal 2 6 are located inward of the three-row roller bearing 7, while the waterproof seal 8 is located outward.

[0040] Two 45° elbows 2.7 are welded to the left and right sides of the lower part of the oil outlet cavity 2, and an outlet flange 2.8 is welded to the end of each 45° elbow 2.7. A spherical crown 2.9 is welded to the bottom of the oil outlet cavity 2.

[0041] The fixed arc plate 3 is an elliptical structure, the upper part of which is connected to the oil outlet cavity 2 by bolts, and the lower part of which is connected to the single-point mooring buoy steel structure by bolts.

[0042] The dynamic leakage detection system 9 mainly consists of an oil leakage hole 9.1 opened in the oil outlet cavity 2, and a hard pipe 9.2, a double ball valve 9.3, and a collecting tank 9.4 which are sequentially connected to the outside of the oil leakage hole 9.1. One side of the hard pipe 9.2 is inserted into the lower main flange 2.1 of the oil outlet cavity 2 and connected to the oil leakage hole 9.1. The double ball valve 9.3 and the collecting tank 9.4 are located outside the oil outlet cavity 2. The double ball valve 9.3 is installed on the hard pipe 9.2, and the collecting tank 9.4 is connected to the hard pipe 9.2. A liquid level gauge 9.6 (using an existing liquid level gauge) that can send an alarm signal is installed on the outside of the collecting tank 9.4. An explosion-proof valve 9.5 is installed on the top, an oil drain valve 9.7 is installed on the bottom, and the bottom is installed on the fixed arc plate 3. As shown in FIG. Figure 2 shown.

[0043] The drive arm 10 is welded from herringbone legs 10.1 and steel plates 10.2. The two herringbone legs 10.1 on one side are hinged to the two side lugs 1.5 of the oil inlet chamber 1 via pins 10.4. The other side of the steel plate 10.2 is connected to a support 10.3 fixed to the steel structure of the single-point mooring buoy and can slide in the center hole of the support 10.3.

[0044] The lower part of the oil inlet chamber 1 is fixed to the inner ring of the three-row roller bearing 7 by bolts, and the upper part of the oil outlet chamber 2 is fixed to the outer ring of the three-row roller bearing 7 by bolts. The oil inlet chamber 1 and the oil outlet chamber 2 can achieve relative rotation through the three-row roller bearing 7. The sand-proof seal 4, dynamic seal 1 5, dynamic seal 2 6, and waterproof seal 8 are all installed in the sealing groove of the oil outlet chamber 2, and are arranged in concentric circles between the relatively sliding surfaces of the oil inlet chamber 1 and the oil outlet chamber 2. Dynamic seal 1 5, dynamic seal 2 6, and waterproof seal 8 all use spring-energized sealing rings, which achieve sealing by pressing the sliding surfaces. The oil leakage hole 9.1 of the dynamic leakage detection 9 is arranged between dynamic seal 1 5 and dynamic seal 2 6 to achieve active sealing leakage detection.

[0045] When dynamic seal 1 (5) leaks, crude oil flows from leak hole 9.1 through hard pipe 9.2 and double ball valve 9.3, ultimately into collection tank 9.4. When the liquid level in collection tank 9.4 reaches the set point, level gauge 9.6, mounted outside of tank 9.4, issues an alarm signal, signaling the need to replace dynamic seal 1 (5). At this point, dynamic seal 2 (6) replaces dynamic seal 1 (5) and acts as a seal, preventing crude oil leakage.

[0046] During normal operation, liquid enters the main chamber through the two inlet flanges 1.4 of the oil inlet chamber 1 and exits through the outlet flange 2.8 of the oil outlet chamber 2. When the single-point mooring buoy steel structure is rotated by an external force, it drives the drive arm 10, which in turn rotates the oil inlet chamber 1 via the herringbone legs 10.1. The lower portion of the oil outlet chamber 2 is connected to the submarine pipeline and remains stationary. However, the inlet and outlet chambers remain connected, ensuring sealed crude oil delivery during rotation.

[0047] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A double-inlet and double-outlet oil transfer rotary joint for single-point mooring, characterized in that: include: An oil inlet cavity (1), an oil outlet cavity (2), a fixed arc plate (3), a sandproof seal (4), a first dynamic seal (5), a second dynamic seal (6), a three-row roller bearing (7), a waterproof seal (8), a dynamic leakage detection (9) and a driving arm (10); the upper portion of the oil inlet cavity (1) is connected to an oil tanker pipeline, and the lower portion is rotatably connected to the oil outlet cavity (2) via the three-row roller bearing (7); and the lower portion of the oil outlet cavity (2) is connected to a submarine pipeline; The connection between the oil inlet cavity (1) and the oil outlet cavity (2) is provided with a sand-proof seal (4), a dynamic seal 1 (5), a dynamic seal 2 (6) and a waterproof seal (8) in sequence from the inside to the outside, the sand-proof seal (4), the dynamic seal 1 (5) and the dynamic seal 2 (6) are located on the inner side of the three-row roller bearing (7), and the waterproof seal (8) is located on the outer side of the three-row roller bearing (7); The upper portion of the fixed circular arc plate (3) is connected to the oil outlet cavity (2), and the lower portion is connected to the single-point mooring buoy steel structure; an oil leakage hole (9.1) is provided at a position on the oil outlet cavity (2) where it is connected to the oil inlet cavity (1); the oil leakage hole (9.1) is located between the first dynamic seal (5) and the second dynamic seal (6); the dynamic leakage detector (9) is installed on the fixed circular arc plate (3), and includes a hard pipe (9.2); the hard pipe (9.2) is inserted into the oil outlet cavity (2) and connected to the oil leakage hole (9.1); One side of the driving arm (10) is connected to the oil inlet cavity (1), and the other side is installed on the single-point mooring buoy steel structure.

2. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 1 is characterized in that: The oil inlet cavity (1) comprises a dome (1.1) and a main passage straight pipe (1.2); the dome (1.1) is welded to the top of the main passage straight pipe (1.2); holes are opened on both sides of the main passage straight pipe (1.2); short straight pipes (1.3) are welded into the openings; each short straight pipe (1.3) is welded with an inlet flange (1.4); the inlet flange (1.4) is connected to a flange of an oil tanker pipeline.

3. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 2 is characterized in that: A bearing mounting flange (1.6) is welded to the bottom of the main passage straight pipe (1.2), a bearing groove for placing a three-row roller bearing (7) is machined inside the bearing mounting flange (1.6), the bearing mounting flange (1.6) is connected to the inner ring of the three-row roller bearing (7) by bolts, and a lower main flange (2.1) is welded to the upper part of the oil outlet cavity (2), and the lower main flange (2.1) is connected to the outer ring of the three-row roller bearing (7) by bolts.

4. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 3 is characterized in that: A wear-resistant ring (1.7) is welded on the lower part of the bearing mounting flange (1.6), and the wear-resistant ring (1.7) is located at the anti-sand seal (4).

5. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 3 is characterized in that: The lower main flange (2.1) is processed with a sand-proof sealing groove (2.2), a dynamic seal 1 sealing groove (2.3), a dynamic seal 2 sealing groove (2.4), a bearing installation groove (2.5), and a seawater-proof dynamic sealing groove (2.6) in sequence along the radial direction. From the center of the cavity toward the outside, a sand-proof seal (4), a dynamic seal 1 (5), a dynamic seal 2 (6), three rows of roller bearings (7), and a waterproof seal (8) are installed in sequence.

6. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 2, characterized in that: Ear plates (1.5) are welded to both sides of the lower portion of the main passage straight pipe (1.2), and the ear plates (1.5) are hinged to the driving arm (10).

7. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 1, characterized in that: The dynamic seal 1 (5), dynamic seal 2 (6) and waterproof seal (8) all adopt spring energy storage sealing rings.

8. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 1, characterized in that: Two 45° elbows (2.7) are welded and extended from the left and right sides of the lower part of the oil outlet cavity (2), and an outlet flange (2.8) is welded to the end of each 45° elbow (2.7). A spherical crown (2.9) is welded to the bottom of the oil outlet cavity (2).

9. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 1, characterized in that: The dynamic leakage detection system (9) further comprises a double ball valve (9.3) and a collection tank (9.4) located outside the oil outlet cavity (2); the double ball valve (9.3) is mounted on the hard pipe (9.2); the collection tank (9.4) is connected to the hard pipe (9.2); a liquid level gauge (9.6) is mounted on the outside of the collection tank (9.4); an explosion-proof valve (9.5) is mounted on the top; an oil drain valve (9.7) is mounted on the bottom; and the bottom is mounted on the fixed arc plate (3).

10. The double-inlet and double-outlet oil transfer rotary joint for single-point mooring according to claim 1, characterized in that: The driving arm (10) comprises two herringbone-shaped legs (10.1) and a steel plate (10.2). One end of the two herringbone-shaped legs (10.1) is hinged to the ear plates (1.5) on both sides of the oil inlet cavity (1) through a pin shaft (10.4), and the other end is welded to the steel plate (10.2). The steel plate (10.2) is connected to a support (10.3) fixed on the steel structure of the single-point mooring buoy and can slide in the middle hole of the support (10.3).

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