CN114251324A - Hollow hydraulic oil cylinder for preventing riser from being flexibly suspended - Google Patents
Hollow hydraulic oil cylinder for preventing riser from being flexibly suspended Download PDFInfo
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- CN114251324A CN114251324A CN202111485466.1A CN202111485466A CN114251324A CN 114251324 A CN114251324 A CN 114251324A CN 202111485466 A CN202111485466 A CN 202111485466A CN 114251324 A CN114251324 A CN 114251324A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1447—Pistons; Piston to piston rod assemblies
- F15B15/1452—Piston sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1438—Cylinder to end cap assemblies
- F15B15/1442—End cap sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/08—Characterised by the construction of the motor unit
- F15B15/14—Characterised by the construction of the motor unit of the straight-cylinder type
- F15B15/1423—Component parts; Constructional details
- F15B15/1457—Piston rods
- F15B15/1461—Piston rod sealings
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
- F15B15/20—Other details, e.g. assembly with regulating devices
- F15B15/22—Other details, e.g. assembly with regulating devices for accelerating or decelerating the stroke
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
- F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
- F15B19/00—Testing; Calibrating; Fault detection or monitoring; Simulation or modelling of fluid-pressure systems or apparatus not otherwise provided for
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Earth Drilling (AREA)
Abstract
The invention provides a hollow hydraulic oil cylinder for preventing a riser from being flexibly suspended, which comprises a hydraulic cylinder body with a hollow structure, wherein an annular inner lantern ring is further arranged inside the hydraulic cylinder body, the hydraulic cylinder body is hermetically connected with the bottom of the inner lantern ring, the outer wall of the inner lantern ring and the inner wall of the hydraulic cylinder body form an annular cavity, a piston rod with a hollow structure of the annular structure is sleeved inside the annular cavity, and the bottom of the piston rod is hermetically connected with the inside of the cavity. The operation window for the suspension riser evacuation is increased, and the safety is greatly improved. The hydraulic oil cylinder in the riser anti-typhoon soft suspension has the function of suspending a riser string during typhoon, and the peak acceleration of the riser is reduced by controlling the movement of the main hydraulic cylinder of the riser anti-typhoon soft suspension hydraulic oil cylinder.
Description
Technical Field
The invention relates to the field of riser soft suspension, in particular to a hollow hydraulic oil cylinder for riser anti-typhoon soft suspension.
Background
Under the condition of typhoon, platform avoidance prevention is one of the most important technical difficulties in marine deepwater drilling operation in China. If the platform is removed in the deep water by adopting a riser suspension mode, the operation window for withdrawing the suspension riser can be enlarged, and the safety is greatly improved. The riser anti-typhoon soft suspension device has the function of suspending a riser string during typhoon, and reduces the peak acceleration of the riser by controlling the movement of a main hydraulic cylinder of the riser anti-typhoon soft suspension device.
The riser anti-typhoon soft suspension device is a key tool for developing deepwater oil gas, is used for connecting a sea surface drilling platform and a seabed wellhead, and isolates seawater from a drilling tool used for drilling and completing wells so as to ensure the safety of underwater operation. When the typhoon comes, the platform needs to stop all operations, and the marine riser is hung up and evacuated from the typhoon path area along with the platform for emergency platform avoidance. The hydraulic cylinder adopted by the conventional riser anti-typhoon soft suspension device is poor in stability, and the peak acceleration of the riser cannot be reduced by the conventional anti-typhoon soft suspension device.
Disclosure of Invention
The invention mainly aims to provide a hollow hydraulic oil cylinder for riser typhoon-proof soft suspension, and solves the problem that a hydraulic cylinder adopted by a riser typhoon-proof soft suspension device is poor in stability, and the situation that the peak acceleration of a riser cannot be reduced by the typhoon-proof soft suspension device
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: the utility model provides a cavity hydraulic cylinder that is used for riser to prevent soft hanging of platform, includes hollow structure's hydraulic cylinder body, the inside annular interior lantern ring that still is equipped with of hydraulic cylinder body, hydraulic cylinder body and interior lantern ring bottom sealing connection, interior lantern ring outer wall and the internal wall of hydraulic cylinder form annular cavity, and annular cavity internal portion overlaps and is equipped with annular structure hollow structure's piston rod, piston rod bottom and the internal sealing connection of cavity.
In the preferred scheme, the piston rod is provided with a metal oxide ceramic layer sprayed on the piston rod;
wherein, HVOF spraying Ni/Cr base layer with thickness not less than 150 μm;
plasma spraying Cr2O3/TiO2 surface layer with the thickness not less than 200 μm. The surface layer hardness is 900 HV-1000 HV.
In the preferred scheme, the bottom of the piston rod is also provided with a rear piston buffering device, the rear piston buffering device divides the cavity into a rod cavity and a rodless cavity, the rod cavity is provided with a first hydraulic oil port, and the rodless cavity is provided with a second hydraulic oil port;
the rod cavity and the rodless cavity are communicated through a pipeline, and a pipeline valve assembly on the cylinder is arranged on the pipeline.
In the preferred scheme, an upper end cover is arranged on the hydraulic cylinder body, a piston rod main seal is arranged between the upper end cover and the piston rod, and a hydraulic adjusting and sealing device is further arranged on the upper end cover and used for adjusting the piston rod main seal.
In the preferred scheme, a sealing end cover is further arranged on the upper end cover, the sealing end cover, the upper end cover and the outer wall of the piston rod form a closed annular cavity, a piston seal is arranged in the annular cavity, the lower end of the piston seal abuts against a main seal of the piston rod, a first cavity is arranged between the piston seal and the sealing end cover, and a first pressurizing connector is further arranged on the hydraulic adjusting and sealing device and penetrates through the upper end cover to be communicated with the first cavity;
the first pressurized coupling pressurizes to cause the piston seal to compress the piston rod primary seal to adjust the combined seal gap of the piston rod primary seal.
In the preferred scheme, the middle part of the upper end cover is provided with an annular boss, a piston seal is provided with a second cavity which forms a second cavity with the annular boss, the hydraulic adjusting and sealing device is also provided with a second pressurizing connector, and the second pressurizing connector penetrates through the upper end cover to be communicated with the second cavity;
the second pressurized coupling is pressurized to sealingly return the piston.
In the preferred scheme, the piston seals the upper third cavity, the third cavity is communicated with the upper end cover and the piston rod, the hydraulic adjusting and sealing device is further provided with a pressure sensor, and the pressure sensor penetrates through the upper end cover to be communicated with the third cavity.
In the preferred scheme, interior lantern ring upper end is equipped with solid fixed ring, and solid fixed ring is connected with the interior lantern ring, and gu fixed ring outer loop and piston rod inner wall are equipped with sealing device.
In the preferred scheme, a piston main seal is arranged between the inner wall and the outer wall of the piston rear buffer device and between the hydraulic cylinder body and the inner lantern ring respectively.
In the preferred scheme, the upper end of the piston rod is also provided with a concave mounting seat with a circular ring structure, the end part of the suspended short section is arranged on the mounting seat, a self-aligning thrust roller bearing is arranged between the end part of the suspended short section and the mounting seat, and a load pressure sensor is arranged between the self-aligning thrust roller bearing and the end part of the suspended short section;
the self-aligning thrust roller bearing is provided with a plurality of positioning blocks, the load pressure sensor is matched with the positioning blocks, and the load pressure sensor is coaxially positioned and connected with the self-aligning thrust roller bearing through the positioning blocks.
The invention provides a hollow hydraulic cylinder for riser anti-typhoon soft suspension, wherein a main hydraulic cylinder of a riser anti-typhoon soft suspension device adopts a U-shaped hollow ceramic piston rod hydraulic cylinder, and the stroke of the hydraulic cylinder of the riser anti-typhoon suspension device is smaller than the amplitude (from the highest point to the lowest point) of the heave motion of a platform, so that the riser anti-typhoon suspension device cannot completely compensate the heave motion of a riser (a riser tensioner can completely compensate), and only a scheme for reducing the acceleration peak value can be adopted. In each platform movement period, when the riser acceleration is smaller than the threshold value, the hydraulic oil cylinder is locked by the control system, and the cylinder body and the piston do not move relatively, so that the riser string and the platform move together. When the acceleration of the marine riser reaches a certain threshold value, the piston of the main hydraulic cylinder moves to reduce the acceleration of the movement of the marine riser under the control of the hydraulic control system, so that the peak value (dynamic load) of the acceleration of the marine riser is reduced by using the limited stroke of the hydraulic cylinder. The marine riser anti-typhoon soft suspension device is a key tool for developing deep water oil gas, is used for connecting a sea drilling platform and a seabed wellhead, and isolates seawater from a drilling tool used for drilling and completing the well so as to ensure the safety of underwater operation.
Drawings
The invention is further illustrated by the following examples in conjunction with the accompanying drawings:
FIG. 1 is a general block diagram of the present invention;
FIG. 2 is a view showing the structure of the outer appearance of the present invention;
FIG. 3 is a specific installation structure diagram of the hanging pipe nipple of the invention;
FIG. 4 is an enlarged structural view of the hydraulic adjustment sealing device of the present invention;
FIG. 5 is a schematic view of the installation of the hanging sub of the present invention;
FIG. 6 is a schematic view of the on-cylinder line valve assembly of the hydraulic cylinder of the present invention;
in the figure: hanging the short section 1; a load pressure sensor 2; a thrust self-aligning roller bearing 3; a hydraulic adjusting sealing device 4; a first compression fitting 401; a second compression fitting 402; a pressure sensor 403; a first cavity 404; a second cavity 405; a piston seal 406; a third cavity 407; a piston rod main seal 5; an upper end cover 6; a hydraulic cylinder 7; an on-cylinder line valve assembly 8; a piston rod 9; a piston primary seal 10; a piston rear cushion device 11; a first hydraulic port 12; a second hydraulic oil port 13; a mounting seat 14; a seal end cap 15; a positioning block 16; a fixed flange 17; an inner collar 18; a fixed ring 19; a mounting base 20.
Detailed Description
Example 1
As shown in fig. 1-6, a hollow hydraulic cylinder for riser anti-typhoon soft suspension comprises a hydraulic cylinder body 7 with a hollow structure, wherein an annular inner lantern ring 18 is further arranged inside the hydraulic cylinder body 7, the hydraulic cylinder body 7 is connected with the bottom of the inner lantern ring 18 in a sealing mode, an annular cavity is formed by the outer wall of the inner lantern ring 18 and the inner wall of the hydraulic cylinder body 7, a piston rod 9 with a hollow structure with an annular structure is sleeved inside the annular cavity, and the bottom of the piston rod 9 is connected with the inside of the cavity in a sealing mode. A main hydraulic cylinder of the riser anti-typhoon soft suspension device adopts a U-shaped hollow ceramic piston rod hydraulic cylinder, a cylinder body of the hydraulic cylinder is located on a clamping jaw of a riser chuck, a piston is hollow, a riser suspension short section 1 is suspended in the middle of the piston, and the structure of the U-shaped hollow ceramic piston rod hydraulic cylinder is shown in figure 1.
The suspended pup joint 1 can work normally in a safe and reliable installation state, and the riser anti-typhoon soft suspension device is a key tool for developing deep water oil gas and is used for connecting a sea surface drilling platform and a seabed wellhead and isolating seawater from a drilling tool used for drilling and completing the well so as to ensure the safety of underwater operation.
In the preferred scheme, the piston rod 9 is provided with a metal oxide ceramic layer sprayed on the piston rod; wherein, HVOF spraying Ni/Cr base layer with thickness not less than 150 μm; plasma spraying Cr2O3/TiO2 surface layer with the thickness not less than 200 μm. The surface layer hardness is 900 HV-1000 HV. In order to prevent the piston rod from being corroded and damaged by marine environment, a ceramic corrosion prevention mode is selected on the surface of the piston rod of the main hydraulic oil cylinder in the device.
In the preferred scheme, the bottom of the piston rod 9 is also provided with a rear piston buffering device 11, the rear piston buffering device 11 divides the cavity into a rod cavity and a rodless cavity, the rod cavity is provided with a first hydraulic oil port 12, the rodless cavity is provided with a second hydraulic oil port 13, the rod cavity and the rodless cavity are communicated through a pipeline, and the pipeline valve assembly 8 on the cylinder is arranged on the pipeline. In the design, the number of oil ports at the end of a rodless cavity is 12 second hydraulic oil ports 13 with the diameter of phi 50mm, the number of first hydraulic oil ports 12 with the diameter of phi 50mm is 10 at the end of a rod cavity, in order to enable oil return of the hydraulic oil cylinder to be rapid, the rod cavity is directly communicated with the rodless cavity, hydraulic oil with the rod cavity can directly return to the rodless cavity, a differential loop oil cylinder is formed, a piston type energy accumulator is arranged in the system, the conventional oil pump motor and other forms are abandoned, and therefore high-flow hydraulic oil can be provided to meet the operation requirement of the main hydraulic oil cylinder.
In the preferred scheme, an upper end cover 6 is arranged on a hydraulic cylinder body 7, a piston rod main seal 5 is arranged between the upper end cover 6 and a piston rod 9, a hydraulic adjusting and sealing device 4 is further arranged on the upper end cover 6, and the hydraulic adjusting and sealing device 4 is used for adjusting the piston rod main seal 5. The piston rod main seal 5 is a V-shaped combined seal, and the hydraulic adjusting seal device 4 pushes the seal piston 406 to move so as to adjust the V-shaped combined seal gap. The concentric sealing piston 406 is designed to uniformly extrude and adjust the V-shaped combined sealing gap, so that the phenomenon of nonuniform extrusion stress of the V-shaped combined sealing is effectively avoided, excessive friction damage of the V-shaped combined seal is reduced, and the service life of the V-shaped combined seal is prolonged.
In a preferable scheme, a sealing end cover 15 is further arranged on the upper end cover 6, the sealing end cover 15, the upper end cover 6 and the outer wall of the piston rod 9 form a closed annular cavity, a piston seal 406 is arranged in the annular cavity, the lower end of the piston seal 406 abuts against the piston rod main seal 5, a first cavity 404 is arranged between the piston seal 406 and the sealing end cover 15, the hydraulic adjusting and sealing device 4 is further provided with a first pressurizing connector 401, the first pressurizing connector 401 penetrates through the upper end cover 6 to be communicated with the first cavity 404, and the first pressurizing connector 401 pressurizes to enable the piston seal 406 to extrude the piston rod main seal 5 so as to adjust a combined sealing gap of the piston rod main seal 5. The piston seal 406 moves under the pressurization of the first pressurization joint 401, and the piston seal 406 uniformly extrudes and adjusts the V-shaped combined sealing gap of the piston rod main seal 5.
In a preferable scheme, an annular boss is arranged in the middle of the upper end cover 6, a second cavity 405 is formed between the piston seal 406 and the annular boss, the hydraulic adjusting and sealing device 4 is further provided with a second pressurizing connector 402, the second pressurizing connector 402 penetrates through the upper end cover 6 to be communicated with the second cavity 405, and the second pressurizing connector 402 pressurizes to enable the piston seal 406 to return. With the configuration shown in fig. 4, the second pressurized coupling 402 functions to unseat the entire piston seal 406. The hydraulic balance mechanism is also used for balancing the extrusion force of the piston rod main seal 5 and the hydraulic thrust of the end face of the piston seal 406, so that the extrusion amount of the piston rod main seal 5 is adjusted, the hydraulic thrust of the end face of the piston seal 406 is too large, the piston rod main seal 5 is excessively extruded, and the abrasion of the combined seal 6 is intensified.
In a preferable scheme, the piston seals 406 are provided with a third cavity 407, the third cavity 407 is communicated with the upper end cover 6 and the piston rod 9, the hydraulic adjusting and sealing device 4 is further provided with a pressure sensor 403, and the pressure sensor 403 is communicated with the third cavity 407 through the upper end cover 6. The third cavity 407 forms an oil storage space for detecting oil pressure, so that the oil pressure inside the third cavity 407 can be conveniently measured to observe the internal sealing condition of the piston rod 9.
In the preferred scheme, the upper end of the inner lantern ring 18 is provided with a fixing ring 19, the fixing ring 19 is connected with the inner lantern ring 18, and the outer ring of the fixing ring 19 and the inner wall of the piston rod 9 are provided with a sealing device. The fixing ring 19 stabilizes the upper end of the inner collar 18 and reinforces the stable structure of the inner collar 18.
In the preferred scheme, a piston main seal 10 is arranged between the inner wall and the outer wall of the piston rear buffering device 11 and the hydraulic cylinder body 7 and the inner lantern ring 18 respectively, and the piston main seal 10 enables the sealing effect of the piston rod 9 to be better.
In the preferred scheme, the upper end of the piston rod 9 is further provided with a concave mounting seat 20 with a circular ring structure, the end part of the suspended pup joint 1 is arranged on the mounting seat 20, a self-aligning thrust roller bearing 3 is arranged between the end part of the suspended pup joint 1 and the mounting seat 20, a load pressure sensor 2 is arranged between the self-aligning thrust roller bearing 3 and the end part of the suspended pup joint 1, a plurality of positioning blocks 16 are arranged on the self-aligning thrust roller bearing 3, the load pressure sensor 2 is matched with the positioning blocks 16, and the load pressure sensor 2 is coaxially positioned and connected with the self-aligning thrust roller bearing 3 through the positioning blocks 16. Hang nipple joint 1 and have the swing and the rotation of certain angle in the use of normal work, and there is corresponding weight, in order to prevent to hang the instability that the swing of nipple joint 1 brought for the hydro-cylinder, 9 tops of piston rod are provided with thrust self-aligning roller bearing 3 and load pressure sensor 2 when the design, thrust self-aligning roller bearing 3 is used for alleviating the instability that hangs nipple joint 1 and cause to the hydraulic cylinder, load pressure sensor 2 is used for monitoring and hangs the nipple joint to the produced pressure of hydraulic cylinder, so that the normal use of better control hydro-cylinder.
Example 2
Further explaining by combining with the embodiment 1, as shown in the structures of fig. 1-6, a suspension short section 1 of the device penetrates through a hollow part of a hydraulic oil cylinder to be connected with the top of a piston rod 9, the suspension short section 1 can swing and rotate at a certain angle in normal working use and has corresponding weight, in order to prevent instability brought to the oil cylinder by the swing of the suspension short section 1, a self-aligning thrust roller bearing 3 and a load pressure sensor 2 are arranged at the top of the piston rod 9 in design, the self-aligning thrust roller bearing 3 is used for relieving the instability of the suspension short section 1 to the hydraulic oil cylinder, and the load pressure sensor 2 is used for monitoring the pressure of the suspension short section 1 to the hydraulic oil cylinder so as to better control the normal use of the oil cylinder.
The main hydraulic cylinder of the device is mainly used when a drilling platform is damaged by typhoon, so that the main hydraulic cylinder cannot stop using equipment for maintenance if hydraulic oil leaks out in normal operation, in order to avoid the leakage of the main seal of the piston rod 9 due to abrasion, the thickness of the main seal of the piston rod 9 is specially added in the design of the main hydraulic cylinder in a hydraulic mode, and if the hydraulic oil leaks out, the width of the main seal of the piston rod 9 can be compressed in a hydraulic mode to prevent the hydraulic oil from leaking out.
In order to prevent the piston rod 9 from being corroded and damaged by marine environment, the surface of the piston rod 9 of the main hydraulic oil cylinder in the device adopts a ceramic corrosion prevention mode,
1) the manufacturing of the piston rod 9 and the spraying process of the metal oxide ceramic layer are carried out according to the standard of' NB _ T35017-.
2) The piston rod 9 is made of a 27SiMn I forging in GB/T3077, the mechanical property of the material reaches the performance of the material after tempering, and 100% of ultrasonic flaw detection reaches the 2-grade quality requirement of GB/T6402.
3) The piston rod 9 is sprayed with a metal oxide ceramic layer. Wherein, HVOF spraying Ni/Cr base layer with thickness not less than 150 μm; plasma spraying Cr2O3/TiO2 surface layer with the thickness not less than 200 μm. The surface layer hardness is 900 HV-1000 HV.
4) The metal oxide layer of the piston rod 9 is detected by a third party detection mechanism. Wherein the salt spray test is more than or equal to 3000h, the bonding strength with the base material of the piston rod 9 is more than or equal to 25N/mm2, the bending strength limit is more than or equal to 300N/mm2, and the ceramic coating allows local repair.
5) The thread tolerance of the piston rod 9 adopts 7-level precision in GB197, and the suspension head thread and the guide section adopt sealing and water proofing and are coated with anti-corrosion grease during assembly.
6) The tolerance of the outer diameter of the guide section of the piston rod 9 is not lower than f7 in GB1801, and the tolerance of the roundness is not lower than 8 grades in GB 1184. The bus straightness tolerance is not more than 1000: 01 but not more than 0.25mm over the entire length.
7) The surface roughness of the guide section of the piston rod 9 is not more than Ra0.35 μm in GB1031 and not less than Ra0.15 μm in GB 1031.
When typhoon comes, the acceleration of the water-isolating pipe reaches a certain threshold, under the control of a hydraulic control system, the piston rod 9 of the main hydraulic cylinder can move along with the frequency of sea waves to reduce the acceleration of the movement of the water-isolating pipe, so the reciprocating movement of the piston rod 9 of the main hydraulic cylinder has the characteristics of high speed, high frequency, long working time and the like, low-friction sealing is selected in the design of the main hydraulic cylinder according to the characteristics, as oil ports with large through diameters are needed, the number of the oil ports at the end of a rodless cavity in the design is 12 oil ports with the through diameter of phi 50mm, the end of a rod cavity is 10 oil ports with the through diameter of 50mm, in order to ensure that the oil return of the hydraulic cylinder is rapid, the phi rod cavity is directly communicated with the rodless cavity, so that the hydraulic oil with the rod cavity can directly return to the rodless cavity to form a differential loop oil cylinder, a piston type energy accumulator is arranged in the system, the conventional oil pump motor is abandoned, therefore, the hydraulic oil with large flow can be provided to meet the operation requirement of the main hydraulic oil cylinder.
The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and the scope of the present invention is defined by the claims, and equivalents including technical features described in the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.
Claims (10)
1. The utility model provides a cavity hydraulic cylinder that is used for riser to prevent soft suspension of platform, characterized by: the hydraulic cylinder comprises a hydraulic cylinder body (7) with a hollow structure, wherein an annular inner sleeve ring (18) is further arranged inside the hydraulic cylinder body (7), the hydraulic cylinder body (7) is connected with the bottom of the inner sleeve ring (18) in a sealing mode, an annular cavity is formed by the outer wall of the inner sleeve ring (18) and the inner wall of the hydraulic cylinder body (7), a piston rod (9) with a hollow structure with an annular structure is sleeved inside the annular cavity, and the bottom of the piston rod (9) is connected with the inside of the cavity in a sealing mode.
2. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 1 is characterized in that: the piston rod (9) is coated with a metal oxide ceramic layer;
wherein, HVOF spraying Ni/Cr base layer with thickness not less than 150 μm;
plasma spraying a Cr2O3/TiO2 surface layer, wherein the thickness is not less than 200 mu m;
the surface layer hardness is 900 HV-1000 HV.
3. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 2 is characterized in that: the bottom of the piston rod (9) is also provided with a piston rear buffering device (11), the piston rear buffering device (11) divides the cavity into a rod cavity and a rodless cavity, the rod cavity is provided with a first hydraulic oil port (12), and the rodless cavity is provided with a second hydraulic oil port (13);
the rod cavity and the rodless cavity are communicated through a pipeline, and a pipeline valve assembly (8) on the cylinder is arranged on the pipeline.
4. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 1 is characterized in that: an upper end cover (6) is arranged on the hydraulic cylinder body (7), a piston rod main seal (5) is arranged between the upper end cover (6) and the piston rod (9), a hydraulic adjusting and sealing device (4) is further arranged on the upper end cover (6), and the hydraulic adjusting and sealing device (4) is used for adjusting the piston rod main seal (5).
5. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 4 is characterized in that: the upper end cover (6) is further provided with a sealing end cover (15), the upper end cover (6) and the outer wall of the piston rod (9) form a closed annular cavity, a piston seal (406) is arranged in the annular cavity, the lower end of the piston seal (406) abuts against a main piston rod seal (5), a first cavity (404) is arranged between the piston seal (406) and the sealing end cover (15), the hydraulic adjusting and sealing device (4) is further provided with a first pressurizing connector (401), and the first pressurizing connector (401) penetrates through the upper end cover (6) to be communicated with the first cavity (404);
the first pressurizing joint (401) pressurizes to enable the piston seal (406) to press the piston rod main seal (5) so as to adjust the combined sealing gap of the piston rod main seal (5).
6. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 5 is characterized in that: an annular boss is arranged in the middle of the upper end cover (6), a second cavity (405) is formed between the piston seal (406) and the annular boss, a second pressurizing joint (402) is further arranged on the hydraulic adjusting and sealing device (4), and the second pressurizing joint (402) penetrates through the upper end cover (6) to be communicated with the second cavity (405);
the second pressurized coupling (402) is pressurized to return the piston seal (406).
7. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 5 is characterized in that: the piston seals a third cavity (407) in the piston (406), the third cavity (407) is communicated with the upper end cover (6) and the piston rod (9), the hydraulic adjusting and sealing device (4) is further provided with a pressure sensor (403), and the pressure sensor (403) penetrates through the upper end cover (6) to be communicated with the third cavity (407).
8. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 4 is characterized in that: the upper end of the inner lantern ring (18) is provided with a fixing ring (19), the fixing ring (19) is connected with the inner lantern ring (18), and the outer ring of the fixing ring (19) and the inner wall of the piston rod (9) are provided with a sealing device.
9. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 2 is characterized in that: and a piston main seal (10) is arranged between the inner wall and the outer wall of the piston rear buffer device (11) and the hydraulic cylinder body (7) and the inner lantern ring (18) respectively.
10. The hollow hydraulic cylinder for riser typhoon-proof soft suspension according to claim 1 is characterized in that: the upper end of the piston rod (9) is also provided with a concave mounting seat (20) with a circular ring structure, the end part of the suspended short section (1) is arranged on the mounting seat (20), a self-aligning thrust roller bearing (3) is arranged between the end part of the suspended short section (1) and the mounting seat (20), and a load pressure sensor (2) is arranged between the self-aligning thrust roller bearing (3) and the end part of the suspended short section (1);
a plurality of positioning blocks (16) are arranged on the self-aligning thrust roller bearing (3), the load pressure sensor (2) is matched with the positioning blocks (16), and the load pressure sensor (2) is coaxially positioned and connected with the self-aligning thrust roller bearing (3) through the positioning blocks (16).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111485466.1A CN114251324A (en) | 2021-12-07 | 2021-12-07 | Hollow hydraulic oil cylinder for preventing riser from being flexibly suspended |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111485466.1A CN114251324A (en) | 2021-12-07 | 2021-12-07 | Hollow hydraulic oil cylinder for preventing riser from being flexibly suspended |
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| Publication Number | Publication Date |
|---|---|
| CN114251324A true CN114251324A (en) | 2022-03-29 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202111485466.1A Pending CN114251324A (en) | 2021-12-07 | 2021-12-07 | Hollow hydraulic oil cylinder for preventing riser from being flexibly suspended |
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| CN (1) | CN114251324A (en) |
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| CN113622847A (en) * | 2021-09-16 | 2021-11-09 | 中海石油(中国)有限公司 | Flexible suspension device for drilling riser and operation method thereof |
| CN216642633U (en) * | 2021-12-07 | 2022-05-31 | 武汉力地液压设备有限公司 | Hollow hydraulic oil cylinder for riser anti-typhoon soft suspension |
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2021
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205371137U (en) * | 2015-12-21 | 2016-07-06 | 南阳市南石力天石油设备有限公司 | Offshore oil rig telescoping cylinder |
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