Positive-pressure explosion-proof MW-level conductive slip ring for offshore oil and gas exploitation platform

Abstract

The invention discloses a positive-pressure explosion-proof MW-level conductive slip ring for an offshore oil and gas exploitation platform, and relates to the technical field of offshore oil and gas exploitation, and the slip ring comprises a main body frame, a main shaft, a ring sheet assembly, a purging control box, a cable bridge, a two-way sleeve, a main support bearing, and an auxiliary slewing bearing. The main shaft is mounted in the main body frame through a main supporting bearing and an auxiliary slewing bearing; the ring sheet assembly is stacked and mounted above the main shaft by adopting insulators, so that stable rotating transmission of MW-level power signals in an ocean vibration environment is ensured; the two-way sleeve is based on an inner and outer side double-cable bridge connection structure, and reliable through-wall transmission of high-voltage power signals can be achieved; the purging control box is mounted on a side cover plate of the main body frame in a wall-mounted manner, so that certain positive pressure on the inner side of the slip ring is ensured, the marine environment is effectively prevented from corroding the internal structure of the slip ring, and positive pressure type explosion prevention of the conductive slip ring is realized; the positive-pressure explosion-proof MW-level conductive slip ring for the offshore oil and gas exploitation platform has the advantages of being large in transmission power, high in environmental adaptability, high in reliability and the like.

Description

Technical Field

[0001] The invention relates to the technical field of offshore oil and gas exploitation, and in particular to a positive pressure explosion-proof MW-level conductive slip ring for an offshore oil and gas exploitation platform. Background Art

[0002] As the core component of offshore oil and gas production platforms, MW-class conductive slip rings are the only channel to achieve rotational transmission of power signals. As one of the single-point failure devices of offshore oil and gas production systems, the reliability of MW-class conductive slip rings is directly related to the operational stability of the entire offshore oil and gas production platform.

[0003] With the large-scale development of my country's offshore oil and gas resource exploitation platforms, the requirements for the power and reliability of offshore oil and gas exploitation platform systems are getting higher and higher. The MW-level conductive slip rings used in offshore oil and gas exploitation platforms have been in service for a long time under harsh sea conditions such as impact, vibration, high humidity, and high salt. They are prone to arc discharge failure caused by corrosion of the electrical contact structure and poor contact stability, which seriously affects the reliable operation of offshore oil and gas exploitation platforms. Therefore, designing a MW-level conductive slip ring for offshore oil and gas exploitation platforms with high reliability and strong environmental adaptability is of great significance to ensuring national energy security. Summary of the invention

[0004] In view of the above technical problems, the present invention proposes a positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform, comprising an auxiliary slewing bearing, a main frame, a ring piece assembly, a main shaft, a purge control box, a cable bridge, a main support bearing, and a double-pass bushing. The main shaft is installed inside the main frame based on the main support bearing and the auxiliary slewing bearing to form an overall sealing structure of the conductive slip ring; the purge control box is wall-mounted on the outside of the main frame, the cable bridge is installed on the main frame, the double-pass bushing is connected to the cable bridge, and the ring piece assembly is installed on the inside of the main frame. Through the cable bridge and the double-pass bushing connection structure, reliable transmission of high-voltage power signals through walls is achieved.

[0005] Preferably, the main frame includes eye screws, a driving arm, a top plate, a side cover plate, a cable auxiliary support column, a stator ring support column, a manhole, a main support column, and a bottom plate. The driving arm is welded and installed on the top of the top plate, and the other side is fixedly connected to the offshore oil and gas production platform by screws. Four eye screws are provided on the top of the top plate to realize the overall lifting of the conductive slip ring. The top plate, the bottom plate, and the main support column are assembled by screw connection to form the main load-bearing structure of the main frame. The stator ring support column and the cable auxiliary support column are installed inside the main frame, the side cover plate is installed on the side of the main frame, and the manhole is installed on the side cover plate.

[0006] Preferably, the ring segment assembly includes a stator ring segment, a rotor ring segment, an insulator, a connector bracket, a plug-in connector, a wire, and a guide pin. One side of the stator ring segment is fixedly connected to the stator ring segment support column through an insulator, and the other side is flexibly electrically connected to the rotor ring segment through a connector bracket, a plug-in connector, and a wire.

[0007] Preferably, a nitrogen pressure regulating and drying device is provided in the purge control box, and dry nitrogen is continuously introduced into the conductive slip ring through a one-way valve to ensure a certain positive pressure inside the conductive slip ring.

[0008] Preferably, three plug-in connectors are evenly arranged on the power signal rotation transmission contact surface of the ring segment assembly, one end of the plug-in connector is mounted on the end face of the rotor ring segment with a U-shaped electrical contact structure, and the power signal rotation transmission is achieved through sliding electrical contact with the end face of the rotor ring segment. The other end is flexibly mounted on the inner side of the stator ring segment through a guide pin and a connector bracket, and can float axially along the guide pin to adapt to the rotor ring segment processing, assembly errors and shaft system runout errors caused by marine environment vibration, thereby improving the product's processability and impact vibration resistance.

[0009] Preferably, the cable auxiliary support column and the stator ring support column both adopt a split design. The cable auxiliary support column includes a cable support column, an auxiliary support rod, a cable binding belt, and a cable auxiliary adjustment bracket. The cable support column is formed by welding a flat base plate and an angle steel and then machining. The installation height of the auxiliary support rod on the cable support column is adjusted to adapt to different cable bridge installation requirements. The cable bridge is fixed on the auxiliary support rod by a cable binding belt. The outer side of the cable binding belt is covered with a layer of heat shrink tubing. The cable auxiliary adjustment bracket is installed on the top plate boss, and the other end is connected to the cable support column.

[0010] Preferably, the stator ring support column includes a stator support column and an upper adjustment bracket. The stator support column is machined after welding a flat base plate and a standard profile. The upper adjustment bracket is installed on the top plate boss and the other end is connected to the stator support column to provide auxiliary support for the stator support column. The cable support column, the cable auxiliary adjustment bracket, the stator support column and the upper adjustment bracket are all provided with axial and radial adjustment holes.

[0011] Preferably, the manhole includes a manhole pillar, a pressure plate, a manhole panel, a lifting ear, a handle, and a manhole boss. Two lifting ears and a handle are welded on the manhole panel to facilitate the lifting and adjustment of the manhole panel. The manhole boss is welded and fixed to the side cover plate. There are 10 manhole pillars distributed around the manhole boss. One end of the pressure plate is fixed to the manhole pillar by screws, and the other end presses the surface of the manhole panel. A sealing ring installation groove is provided on the top of the manhole boss, which is squeezed with the manhole panel to ensure that the manhole has good sealing.

[0012] Preferably, the main frame and the main shaft are assembled and formed by welding 316L stainless steel, and the surface is coated with a three-layer process of solvent-free epoxy primer, epoxy micaceous iron intermediate paint and polyurethane topcoat to ensure that the exposed parts of the conductive slip ring have good corrosion resistance.

[0013] Preferably, the stator ring segments adopt a cable bridge and a double-pass bushing combination structure to achieve reliable through-wall transmission of high-voltage power signals. Since the cable bridge has a thick insulation layer and a large bending radius, the cable bridge connected to the stator ring segments is installed in a spiral lifting manner along the outer side of the conductive slip ring, supplemented by a cable auxiliary support column to ensure reliable connection of the cable bridge.

[0014] Preferably, the main support bearing adopts a cross cylindrical roller bearing, which can withstand larger radial and axial loads; the auxiliary slewing bearing adopts a four-point ball contact bearing, which ensures that the conductive slip ring has good supporting rigidity and high rotation accuracy; 24 grease filling holes are arranged on the outside of the main support bearing and the auxiliary slewing bearing, which ensures that the conductive slip ring can still achieve uniform grease addition under small angle deflection.

[0015] Compared with the prior art, the present invention has the following beneficial effects: (1) A nitrogen pressure regulating and drying device is arranged in the purge control box of the present invention, and dry nitrogen is continuously introduced into the conductive slip ring through a one-way valve to ensure a certain positive pressure (200-300Pa) inside the conductive slip ring, thereby realizing a positive pressure explosion-proof design of the conductive slip ring, improving the heat dissipation performance of the ring plate assembly inside the conductive slip ring, effectively preventing the high humidity and high salt gas in the marine environment from corroding the internal structural parts of the slip ring, and improving the adaptability of the conductive slip ring to the marine environment; (2) The power signal rotation transmission contact surface of the ring segment assembly of the present invention is evenly distributed with three plug-in connectors. One end of the plug-in connector adopts a U-shaped electrical contact structure to be engaged and installed on the end face of the rotor ring segment. The power signal rotation transmission is achieved by sliding electrical contact with the end face of the rotor ring segment. The other end is flexibly installed on the inner side of the stator ring segment through a guide pin and a connector bracket. It can float axially along the guide pin, adapt to the machining and assembly errors of the rotor ring segment and the shaft runout error caused by the vibration of the marine environment, and improve the product processability and anti-impact vibration performance. (3) The cable auxiliary support column and stator ring support column of the present invention are both designed in a split manner. The cable support column, cable auxiliary adjustment bracket, stator support column, and upper adjustment bracket are all provided with axial and radial adjustment holes, which can adapt to the processing and assembly errors of the main support column, top plate, stator ring and other parts, and improve the assembly processability of the conductive slip ring. (4) The ring segment assembly of the present invention adopts a stacked installation method, based on 8 evenly distributed rotor ring segment insulation columns and connection terminals, to achieve insulation support between multiple layers of rotor ring segments. Compared with the traditional staggered support method, the support method adopted by the present invention does not require the rotor ring segments to bear additional bending moments, and has the advantages of higher reliability and stronger resistance to impact and vibration. (5) The conductive slip ring for offshore oil and gas production platform provided by the present invention has an O-ring sealing structure on the static-static joint surface and a double-layer lip sealing ring on the dynamic-static joint surface, thereby ensuring that the conductive slip ring for offshore oil and gas production platform has good protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the structure of the MW-class conductive slip ring of the present invention.

[0017] Figure 2 It is a schematic diagram of the main frame structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the structure of the cable auxiliary support column of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the stator ring support column of the present invention.

[0020] Figure 5 It is a schematic diagram of the manhole structure of the present invention.

[0021] Figure 6 The structure of the ring plate assembly of the present invention is schematically shown in FIG. Figure 1 .

[0022] Figure 7 The structure of the ring plate assembly of the present invention is schematically shown in FIG. Figure 2 .

[0023] Figure 8 It is a partial schematic diagram of the ring sheet stacking structure of the present invention.

[0024] Figure numbers: 1- auxiliary slewing bearing; 2- main frame; 3- ring segment assembly; 4- main shaft; 5- purge control box; 6- cable bridge; 7- main support bearing; 8- double-pass casing; 21- eyebolt; 22- driving arm; 23- top plate; 24- side cover plate; 25- auxiliary cable support column; 26- stator ring segment support column; 27- manhole; 28- main support column; 29- bottom plate; 31- stator ring segment; 32- rotor ring segment; 33- stator ring segment insulation column; 34-connector bracket; 35-plug connector; 36-wire; 37-guide pin; 38-rotor ring insulation column; 39-connection terminal; 251-cable support column; 252-auxiliary support rod; 253-cable binding belt; 254-cable auxiliary adjustment bracket; 261-stator support column; 262-upper adjustment bracket; 271-manhole support column; 272-pressure plate; 273-manhole panel; 274-lifting ear; 275-handle; 276-manhole boss. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0026] Example: Figure 1-Figure 8 A positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform is shown, comprising an auxiliary slewing bearing 1, a main frame 2, a ring piece assembly 3, a main shaft 4, a purge control box 5, a cable bridge 6, a main support bearing 7, and a double-pass sleeve 8. The main shaft 4 is installed inside the main frame 2 based on the main support bearing 7 and the auxiliary slewing bearing 1 to form an overall sealing structure of the conductive slip ring; the purge control box 5 is wall-mounted on the outside of the main frame 2, the cable bridge 6 is installed on the main frame 2, the double-pass sleeve 8 is connected to the cable bridge 6, and the ring piece assembly 3 is installed on the inside of the main frame 2. Through the connection structure of the cable bridge 6 and the double-pass sleeve 8, reliable transmission of high-voltage power signals through the wall is achieved.

[0027] The purge control box 5 is provided with a nitrogen pressure regulating and drying device, and dry nitrogen is continuously introduced into the conductive slip ring through a one-way valve to ensure a certain positive pressure (200-300Pa) inside the conductive slip ring, thereby realizing a positive pressure explosion-proof design of the conductive slip ring, improving the heat dissipation performance of the internal ring sheet assembly of the conductive slip ring, effectively preventing the high humidity and high salt gas in the marine environment from corroding the internal structural parts of the slip ring, and improving the adaptability of the conductive slip ring to the marine environment.

[0028] The main support bearing 7 adopts a cross cylindrical roller bearing, which can withstand large radial and axial loads. The auxiliary slewing bearing 1 adopts a four-point ball contact ball bearing to ensure that the conductive slip ring has good support rigidity and high rotation accuracy. 24 grease filling holes are arranged on the outside of the main support bearing 7 and the auxiliary slewing bearing 1 to ensure that the conductive slip ring can still achieve uniform grease addition under small angle deflection.

[0029] The main frame 2 and the main shaft 4 are assembled and formed by welding 316L stainless steel, and the surface is coated with a three-layer process of solvent-free epoxy primer, epoxy micaceous iron intermediate paint and polyurethane topcoat to ensure that the exposed parts of the conductive slip ring have good corrosion resistance.

[0030] like Figure 2As shown, the main frame 2 includes a driving arm 22, a top plate 23, a side cover plate 24, a cable auxiliary support column 25, a stator ring support column 26, a manhole 27, a main support column 28, and a bottom plate 29. The driving arm 22 is welded and fixed to the top of the top plate 23, and the other side of the driving arm 22 is fixedly connected to the offshore oil and gas production platform by screws. Four lifting screws 21 are arranged on the top of the top plate 23 to realize the overall lifting of the conductive slip ring. The top plate 23, the bottom plate 29, and the main support column 28 are assembled by screw connection to form the main load-bearing structure of the main frame 2. The stator ring support column 26 and the cable auxiliary support column 25 are all installed inside the main load-bearing structure. The side cover plate 24 is installed on the side of the main load-bearing structure. The manhole 27 is installed on the side cover plate 24; the cable auxiliary support column 25 and the stator ring support column 26 are both designed in a split manner.

[0031] like Figure 3 As shown, the cable auxiliary support column 25 includes a cable support column 251, an auxiliary support rod 252, a cable binding belt 253, and a cable auxiliary adjustment bracket 254. The cable support column 251 is formed by welding a flat base plate and an angle steel and then machining. The cable support column 251 is provided with mounting holes every 100 mm. By adjusting the mounting height of the auxiliary support rod 252 on the cable support column 251, it can adapt to different cable bridge 6 installation requirements. The cable bridge 6 is fixedly installed on the auxiliary support rod 252 by the cable binding belt 253. The outer side of the cable binding belt 253 is coated with a layer of heat shrink tubing to prevent the cable binding belt 253 from scratching the insulation layer of the cable bridge. The cable auxiliary adjustment bracket 254 is installed on the boss of the top plate 23, and the other end is connected to the cable support column 251 to provide auxiliary support for the cable support column 251.

[0032] The cable support column 251 and the cable auxiliary adjustment bracket 254 are both provided with axial and radial adjustment holes, which can adapt to the processing and assembly errors of components such as the main support column 28 and the top plate 23, and improve the assembly processability of the conductive slip ring.

[0033] like Figure 4 As shown, the stator ring support column 26 includes a stator support column 261 and an upper adjustment bracket 262. The stator support column 261 is formed by welding a flat base plate and a standard profile and then machining. The upper adjustment bracket 262 is installed on the boss of the top plate 23, and the other end is connected to the stator support column 261, which plays an auxiliary supporting role for the stator support column 261. The stator support column 261 and the upper adjustment bracket 262 are both provided with axial and radial adjustment holes, which can adapt to the processing and assembly errors of components such as the main support column 28, the top plate 23, and the rotor ring 32, thereby improving the assembly processability of the conductive slip ring.

[0034] like Figure 5As shown, the manhole 27 includes a manhole pillar 271, a pressure plate 272, a manhole panel 273, a lifting ear 274, a handle 275, and a manhole boss 276. Two lifting ears 274 and a handle 275 are welded on the manhole panel 273 to facilitate the lifting and adjustment of the manhole panel. The manhole boss 276 is welded and fixed to the side cover 24. There are 10 manhole pillars 271 distributed around the manhole boss 276. One end of the pressure plate 272 is fixed to the manhole pillar 271 by screws, and the other end presses the surface of the manhole panel 273. A sealing ring mounting groove is provided on the top of the manhole boss 276, which is squeezed with the manhole panel 273 to ensure that the manhole 27 has good sealing.

[0035] like Figure 6-Figure 7 As shown, the ring segment assembly structure 3 includes a stator ring segment 31, a rotor ring segment 32, an insulator 33, a connector bracket 34, a wire 36, and a guide pin 37. Three plug-in connectors 35 are evenly arranged on the power signal rotation transmission contact surface of the ring segment assembly 3. One side of the stator ring segment 31 is fixedly connected to the stator ring segment support column 26 through the insulator 33, and the other side is flexibly electrically connected to the rotor ring segment 32 through the connector bracket 34, the plug-in connector 35, and the wire 36.

[0036] One end of the plug-in connector 35 is mounted on the end face of the rotor ring segment 32 with a U-shaped electrical contact structure, and realizes the rotational transmission of the power signal through sliding electrical contact with the end face of the rotor ring segment 32. The other end is flexibly mounted on the inner side of the stator ring segment 31 through a guide pin 37 and a connector bracket 34, and can float axially along the guide pin 37, and adapt to the machining and assembly errors of the rotor ring segment 32 and the shaft system runout error caused by the vibration of the marine environment, thereby improving the product's processability and impact and vibration resistance.

[0037] The stator ring segment 31 adopts a combined structure of a cable bridge 6 and a double-pass bushing 8 to achieve reliable wall-penetrating transmission of high-voltage power signals. Since the cable bridge 6 has a thicker insulation layer and a larger bending radius, the cable bridge 6 connected to the stator ring segment 31 is installed in a spiral lifting manner along the outer side of the conductive slip ring, and is supplemented by a cable auxiliary support column 25 to ensure reliable connection of the cable bridge 6.

[0038] The outer surface of the rotor ring sheet 32 ​​should be plated with precious metal silver to further reduce the contact resistance between the plug-in connector 35 and the rotor ring sheet 32 ​​.

[0039] like Figure 8 As shown, the ring segment assembly 3 is installed in a stacked manner, based on 8 evenly arranged rotor ring segment insulation columns 38 and connecting terminals 39, to achieve insulation support between multiple layers of rotor ring segments 32. Compared with the traditional staggered support method, the support method adopted by the present invention enables the rotor ring segments 32 to not need to bear additional bending moments, and has the advantages of higher reliability and stronger resistance to impact and vibration.

[0040] The conductive slip ring for an offshore oil and gas production platform provided by the present invention has an O-ring sealing structure at the static-static joint surface and a double-layer lip sealing ring at the dynamic-static joint surface, so as to ensure that the conductive slip ring for an offshore oil and gas production platform has good protection performance.

[0041] The above contents are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, various changes and modifications may be made according to the present invention. Any modifications, equivalent substitutions and improvements made within the design principles of the present invention should be covered within the protection scope of the present invention.

Claims

1. A positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform, comprising an auxiliary slewing bearing (1), a main frame (2), a ring assembly (3), a main shaft (4), a purge control box (5), a cable bridge (6), a main support bearing (7), and a double-pass sleeve (8), characterized in that: The main shaft (4) is installed inside the main frame (2) based on the main support bearing (7) and the auxiliary slewing bearing (1), forming a conductive slip ring integral sealing structure; the purge control box (5) is wall-mounted on the outside of the main frame (2), the cable bridge (6) is installed on the main frame (2), the double-pass bushing (8) is connected to the cable bridge (6), and the ring piece assembly (3) is installed on the inside of the main frame (2). Through the connection structure of the cable bridge (6) and the double-pass bushing (8), reliable transmission of high-voltage power signals through the wall is achieved; The main frame (2) comprises a driving arm (22), a top plate (23), a side cover plate (24), a cable auxiliary support column (25), a stator ring support column (26), a manhole (27), a main support column (28), and a bottom plate (29); the driving arm (22) is welded and fixed to the top of the top plate (23); the other side of the driving arm (22) is fixedly connected to the offshore oil and gas production platform by screws; four lifting eye screws (21) are arranged at the top of the top plate (23) to realize the overall lifting of the conductive slip ring; the top plate (23), the bottom plate (29), and the main support column (28) are assembled by screw connection to form the main load-bearing structure of the main frame (2); the stator ring support column (26) and the cable auxiliary support column (25) are all installed inside the main frame (2); the side cover plate (24) is installed on the side of the main frame (2); and the manhole (27) is installed on the side cover plate (24); The ring segment assembly structure (3) comprises a stator ring segment (31), a rotor ring segment (32), an insulator (33), a connector bracket (34), a plug-in connector (35), a wire (36), and a guide pin (37); one side of the stator ring segment (31) is fixedly connected to a stator ring segment support column (26) via the insulator (33), and the other side is flexibly electrically connected to the rotor ring segment (32) via the connector bracket (34), the plug-in connector (35), and the wire (36).

2. The positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform as claimed in claim 1, characterized in that: The purge control box (5) is provided with a nitrogen pressure regulating and drying device, and dry nitrogen is continuously introduced into the conductive slip ring through a one-way valve to ensure that a positive pressure exists inside the conductive slip ring.

3. The positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform as claimed in claim 1, characterized in that: Three plug-in connectors (35) are evenly arranged on the power signal rotation transmission contact surface of the ring segment assembly (3). One end of the plug-in connector (35) is mounted on the end face of the rotor ring segment (32) by means of a U-shaped electrical contact structure, and achieves power signal rotation transmission by means of sliding electrical contact with the end face of the rotor ring segment (32). The other end is flexibly mounted on the inner side of the stator ring segment (31) via a guide pin (37) and a connector bracket (34), and can float axially along the guide pin (37), so as to adapt to machining and assembly errors of the rotor ring segment (32) and shaft runout errors caused by marine environmental vibration, thereby improving product processability and anti-impact vibration performance.

4. The positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform as claimed in claim 1, characterized in that: The cable auxiliary support column (25) and the stator ring support column (26) are both designed in a split-type manner. The cable auxiliary support column (25) comprises a cable support column (251), an auxiliary support rod (252), a cable binding belt (253), and a cable auxiliary adjustment bracket (254). The cable support column (251) is formed by welding a flat bottom plate and an angle steel and then machining. The installation height of the auxiliary support rod (252) on the cable support column (251) is adjusted to meet the installation requirements of different cable bridges (6). The cable bridge (6) is fixedly installed on the auxiliary support rod (252) by means of a cable binding belt (253). The outer side of the cable binding belt (253) is coated with a layer of heat shrink tubing. The cable auxiliary adjustment bracket (254) is installed on a boss of the top plate (23), and the other end is connected to the cable support column (251).

5. The positive pressure explosion-proof MW-class conductive slip ring for an offshore oil and gas production platform as claimed in claim 4, characterized in that: The stator ring support column (26) comprises a stator support column (261) and an upper adjustment bracket (262). The stator support column (261) is formed by welding a flat bottom plate and a standard profile and then machining. The upper adjustment bracket (262) is mounted on a boss of the top plate (23) and has the other end connected to the stator support column (261) to play an auxiliary supporting role for the stator support column (261). The cable support column (251), the cable auxiliary adjustment bracket (254), the stator support column (261) and the upper adjustment bracket (262) are all provided with axial and radial adjustment holes.

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