CN113161940A

CN113161940A - Bending limiter with heat dissipation function

Info

Publication number: CN113161940A
Application number: CN202110384448.8A
Authority: CN
Inventors: 余杨; 吴凡蕾; 余建星; 刘嘉豪; 姚云鹏; 孙文正
Original assignee: Tianjin University
Current assignee: Tianjin University
Priority date: 2021-04-09
Filing date: 2021-04-09
Publication date: 2021-07-23

Abstract

The invention relates to a bending limiter with a heat dissipation function, which is used for protecting a flexible vertical pipe and comprises a heat dissipation module unit and a connecting module unit, wherein the heat dissipation module unit comprises two semi-arc-shaped inner modules, the inner diameter of each inner module is matched with the pipe diameter of the flexible vertical pipe, each inner module comprises an inner module main body positioned in the middle and end bosses respectively arranged at two ends, heat dissipation holes are formed in the inner module main bodies, and the two inner modules are coated on the outer surface of the flexible vertical pipe to form a heat dissipation module unit; the connecting module unit comprises two semicircular outer modules which are connected with each other, and two ends of the two outer modules are connected with each other and can be wrapped outside the flexible vertical pipe and the inner module; each outer module comprises a middle part, two side parts and two ends, the inner diameter of the middle part of the outer module is matched with the pipe diameter of the flexible vertical pipe, two side grooves are symmetrically distributed on the two side parts of the outer module along the inner wall, and the sizes of the side grooves are matched with the bosses at the end parts of the inner modules.

Description

Bending limiter with heat dissipation function

Technical Field

The invention relates to an open-close type bending limiter with a heat dissipation effect, and belongs to the field of submarine cable protection in an offshore platform.

Background

With the trend of shortage of offshore resource exploitation, in recent years, oil and gas resource exploitation gradually steps into deep sea, and the improvement of the autonomous design and construction technology of deep sea oil and gas development equipment and the design capability of large-scale ocean engineering equipment is urgent. The deep sea flexible riser is a bridge between an ocean platform and a seabed oil field and is a key part in a deep sea oil and gas exploitation system. Compared with the traditional rigid riser, the flexible riser has lower rigidity and stronger plasticity, can be more suitable for severe deep sea environment, and is generally applied to the deep sea for oil and gas exploitation. The bending capacity of the device is strong, and an overhigh bending moment is easily formed at the interface of the deep sea oilfield, so that the local damage of the riser is caused, and therefore a bending reinforcer needs to be arranged at a local easily damaged position to avoid damage, such as the interface of the deep sea oilfield and the interface of an upper floating body. At the interface of the deep sea oil field, oil and gas resources are exploited from the ground bottom, the temperature of the section of the vertical pipe is higher than that of other parts, and in addition, the part is provided with a bending limiter, so that the heat transfer of the vertical pipe is hindered to a certain extent, and the phenomenon of local temperature concentration is caused. At present, most of common deep sea riser bending limiters adopt an integrated closed structure and are installed at a deep sea oil field connector in a multi-section connection mode, namely, a plurality of bending limiters are connected together by positioning pins and sleeved on one section of flexible riser at the connector, which is equivalent to adding one section of closed protective sleeve on the flexible riser. The temperature of the riser at the outlet of the oil field is higher than that of other parts, and the heat transfer of the section of the riser is greatly influenced by the closed bending reinforcer. The flexible vertical pipe is usually composed of a plurality of layers of different materials, the highest working temperature which can be borne by the different materials is different, and the flexible vertical pipe easily exceeds the highest working temperature which can be borne by a certain layer of material under the condition of high-temperature continuous operation, so that the structure of the layer of the vertical pipe fails, and the service life of the flexible vertical pipe is influenced. Therefore, a bending limiter with heat dissipation function is needed to solve the above problems.

Disclosure of Invention

In order to overcome the defects in the prior art, the invention provides the flexible vertical pipe bending limiter with the heat dissipation function, and the design of the air holes is adopted to help reduce the heat concentration effect of the flexible vertical pipe and reduce the damage of vertical pipe materials caused by overhigh temperature. The technical scheme is as follows:

a bending limiter with a heat dissipation function is used for protecting a flexible vertical pipe and comprises a heat dissipation module unit and a connection module unit, wherein the heat dissipation module unit comprises two semi-arc-shaped inner modules, the inner diameter of each inner module is matched with the pipe diameter of the flexible vertical pipe, each inner module comprises an inner module main body positioned in the middle and end bosses (201) respectively arranged at two ends, heat dissipation holes are formed in the inner module main bodies, and the two inner modules are coated on the outer surface of the flexible vertical pipe to form a heat dissipation module unit; the connecting module unit comprises two semicircular outer modules which are connected with each other, and two ends of the two outer modules are connected with each other and can be wrapped outside the flexible vertical pipe and the inner module; each outer module comprises a middle part, two side parts and two ends, the inner diameter of the middle part of each outer module is matched with the pipe diameter of the flexible vertical pipe, two side grooves (101) are symmetrically distributed on the two side parts of each outer module along the inner wall, and the size of each side groove (101) is matched with that of a boss (201) at the end part of each inner module and used for connecting adjacent heat dissipation module units at the two ends.

Furthermore, the connection mode of the connection module unit is a rotary opening and closing mode, and the two outer modules are connected through a rotary connecting piece (3). The other ends of the two semicircular outer modules of the connecting module unit are fixedly connected through bolts and bolt holes.

Further, an external slope surface 203 is arranged in a groove between the end boss 201 of the inner module and the main body of the inner module, and internal slope surfaces 102 matched with the external slope surfaces 203 of the inner module are arranged at two ends of the outer module along the inner wall.

Further, the rotary connecting piece comprises a connecting piece boss 301 which is arranged at the end part of one semicircular outer module and is provided with a through hole, a telescopic pin 302 and a connecting piece groove 305 arranged at the end part of the other semicircular outer module, holes are arranged on the inner walls of two sides of the connecting piece groove 305, and the sizes of the connecting piece boss 301 and the connecting piece groove 305 are matched; the telescopic pin 302 is positioned in the through hole of the connecting piece boss 301, and the two ends of the telescopic pin are designed with cylinders 303 with smaller diameters than the middle part, so that the telescopic pin 302 can be fixed and telescopic at the same time, and is convenient to fix in the holes 304 at the two ends of the groove 305.

Furthermore, two inner modules forming one heat dissipation module unit are fixedly connected through bolts and bolt holes.

Compared with the prior art, the invention has the following advantages and effects:

1) the two modules of the deep-sea flexible riser bending limiter disclosed by the invention respectively play their own roles, are respectively machined and manufactured, and are simpler to machine two simple parts than a complex part, so that the efficiency of machining and manufacturing the parts is improved.

2) The invention has simple installation and convenient disassembly. The inner bending limiter module is fixed on the outer side of the vertical pipe through screws, the outer bending limiter module is sleeved on the outer side of the vertical pipe in a rotary opening and closing mode, the built-in grooves are matched with bosses at two ends of the inner bending limiter module, and the process is repeated to finish the installation of the bending limiter.

3) The invention adopts the form that the built-in retractable pin is used as the rotating shaft at the rotating shaft part of the outer module of the bending limiter, the retractable pin is convenient and firm to install, the corrosion of the rotating shaft material exposed in seawater can be reduced due to the built-in rotating shaft, and the service efficiency of the rotary opening and closing device is prolonged.

4) The invention distributes the heat dissipation square holes on the outer side of the inner module of the bending limiter, the square holes have uniform size and are uniformly distributed at intervals of 45 degrees, the symmetrical distribution of the pressure intensity in the pipe is ensured, the heat transmission of the fluid in the pipe is facilitated, and the local heat concentration phenomenon of the vertical pipe is avoided.

Drawings

FIG. 1 is a schematic view of the overall construction of a bend limiter;

FIG. 2 is a schematic view of the internal structure of an outer mold of the bend limiter;

FIG. 3 is a schematic view of the structure of the rotating shaft of the outer mold block of the bending limiter;

FIG. 4 is a schematic view of a disassembled structure of an inner module of the bending limiter;

FIG. 5 is a cross-sectional view of a riser and bend limiter;

FIG. 6 is an overall schematic view of a multi-section bend limiter mounted on a riser.

Detailed Description

The invention is further described below with reference to the accompanying drawings.

As shown in fig. 1 and 2, the bending limiter with heat dissipation function of the present invention is used for protecting a flexible vertical pipe, and includes a heat dissipation module unit and a connection module unit, the heat dissipation module unit includes two semi-arc inner modules, the inner diameter of the inner modules matches with the pipe diameter of the flexible vertical pipe, the inner modules include an inner module main body located in the middle and end bosses 201 respectively disposed at both ends, an external slope surface 203 is disposed in a groove between the end boss 201 and the inner module main body, heat dissipation holes are disposed on the inner module main body, and the two inner modules are wrapped on the outer surface of the flexible vertical pipe to form a heat dissipation module unit; the connecting module unit is in a rotary opening and closing mode and comprises two semicircular outer modules connected through a rotary connecting piece 3, and the other ends of the two outer modules are connected with each other and can be wrapped outside the flexible vertical pipe and the inner module; each semicircular outer module comprises a middle part, two side parts and two ends, the inner diameter of the middle part of each semicircular outer module is matched with the pipe diameter of the flexible vertical pipe, two side grooves 101 are symmetrically distributed on the two side parts of each semicircular outer module along the inner wall, and the size of each side groove 101 is matched with that of a boss 201 at the end part of the inner module and used for connecting adjacent heat dissipation module units at the two ends.

The heat dissipation module unit and the connecting module unit are connected with the boss of the inner module through the groove of the outer module. The groove 101 in the outer die block of the bending limiter is square, a small-radius fillet is arranged at the interface of the surface, and the size of the groove is one circle larger than that of the boss 201 of the inner die block of the bending limiter. The inner edge of the outer module is provided with a slope surface 102 which is parallel to the slope surfaces 203 on the two sides of the inner module when the outer module is connected with the inner module, and the outer interface of the outer module is also provided with a small-radius fillet 103. The outer module is a bending limiter in a rotary opening and closing mode, one side of the outer module rotates by taking the rotary connecting piece 3 as a shaft, and the junction of two side surfaces of the rotary shaft is provided with a large-radius fillet 106 to prevent the two walls from colliding during opening and closing; the other side is closed by two symmetrically arranged recesses 104, which recesses 104 are centrally provided with screw holes 105 for receiving screws for fixing the module.

Fig. 3 is a schematic view showing a disassembled structure of the rotating connecting member 3 of the outer module of the bending limiter, and the whole rotating connecting member is installed at the center of the plane 107 and is composed of a boss 301 with a through hole, a retractable pin 302 and a groove 305 with holes at two ends. Wherein the through-hole size in the middle of the boss 301 is a little bit bigger than the diameter of scalable pin 301, and scalable pin 302 both ends design has the cylinder 303 that is littleer than middle diameter, fixed on one side, can stretch out and draw back on one side, is convenient for install in the hole 304 at recess 305 both ends. The sidelines on both sides of the rotary connecting piece are opened into a large-diameter fillet 106 to prevent the collision of the two sides of the open-close type.

Fig. 4 is a disassembly schematic diagram of an inner module of a bending limiter, wherein two ends of the inner module are provided with bosses 201 for connecting with an outer module, the edges of the bosses and the edges of outer slope surfaces 203 are also provided with small radius fillets 202, and the outer slope surfaces 203 are parallel to inner slope surfaces 102 of the outer module. The inner modules are connected through symmetrically distributed grooves 204, and screw holes 205 are formed in the grooves 204 to facilitate screw installation. The wall of the inner module is uniformly distributed with square holes 206, three holes are distributed in one row, two rows are distributed in total, and 6 square holes are distributed on the single surface for heat dissipation. Fig. 5 is a schematic cross-sectional view of a riser and a bending limiter, the bending limiter being mounted on the outside of the riser 4, the two modules being connected to each other by an internal structure, a section of the bending limiter being completely mounted on the riser as shown in fig. 6.

When the invention is installed, firstly, the inner module is sleeved on a certain position of the vertical pipe, and screws penetrate through the screw holes 205 to be installed in the grooves which are symmetrical on two sides, so that the inner module is fixed. Then the outer module is clamped at the boss positions at the two sides of the inner module and sleeved at the two sides of the inner module, and screws penetrate through the two screw holes at one side of the outer module and are arranged in the two grooves to fix the outer module. If a section of bending limiter needs to be installed, the inner module is installed at a set position according to the installation method, and then the outer module is embedded on the inner module according to the position of the inner module, so that the installation of the bending limiter can be completed.

The installation position and the component size of the invention are determined according to actual working conditions.

Claims

1. A bending limiter with a heat dissipation function is used for protecting a flexible vertical pipe and comprises a heat dissipation module unit and a connection module unit, wherein the heat dissipation module unit comprises two semi-arc-shaped inner modules, the inner diameter of each inner module is matched with the pipe diameter of the flexible vertical pipe, each inner module comprises an inner module main body positioned in the middle and end bosses (201) respectively arranged at two ends, an external slope surface (203) is arranged in a groove between each end boss (201) and the corresponding inner module main body, heat dissipation holes are formed in the inner module main bodies, and the two inner modules are coated on the outer surface of the flexible vertical pipe to form the heat dissipation module unit; the connecting module unit comprises two semicircular outer modules which are connected with each other, and two ends of the two outer modules are connected with each other and can be wrapped outside the flexible vertical pipe and the inner module; each outer module comprises a middle part, two side parts and two ends, the inner diameter of the middle part of each outer module is matched with the pipe diameter of the flexible vertical pipe, two side grooves (101) are symmetrically distributed on the two side parts of each outer module along the inner wall, and the size of each side groove (101) is matched with that of a boss (201) at the end part of each inner module and used for connecting adjacent heat dissipation module units at the two ends.

2. A bending limiter according to claim 1, wherein the connection module unit is connected in a rotational opening and closing manner, and the two outer modules are connected by a rotational connector (3).

3. The bending limiter according to claim 2, wherein the rotary connector comprises a connector boss (301) provided with a through hole at one end of the outer module, a retractable pin (302), and a connector groove (305) provided at the other end of the outer module, wherein holes are formed in the inner walls of the two sides of the connector groove (305), and the connector boss (301) and the connector groove (305) are matched in size; the telescopic pin (302) is positioned in the through hole of the connecting piece boss (301), the two ends of the telescopic pin are provided with cylinders (303) with smaller diameters than the middle part of the telescopic pin, and the telescopic pin can be fixed and telescopic at one side, so that the telescopic pin (302) can be conveniently fixed in the holes (304) at the two ends of the groove (305).

4. The bending limiter according to any one of claims 2 or 3, wherein the other ends of the two outer modules of the connection module unit are fixedly connected by bolts and bolt holes.

5. The bend limiter of claim 1 wherein the two ends of each outer module are provided along the inner wall with inner ramp surfaces (102) that mate with the outer ramp surfaces (203) of the inner module.

6. The bending limiter according to claim 1, wherein the two inner modules constituting one heat radiating module unit are fixedly coupled to each other by bolts and bolt holes.