A load-balanced flange adapter and locking method

Abstract

The present invention discloses a flange adapter with balanced load, which belongs to the field of adapters and includes a central body with a through center. A cavity is circumferentially arranged in the central body, the pressure in the cavity is adjustable, and a plurality of first fasteners and second fasteners are movably installed in sequence on the upper and lower sides of the central body. The pressure in the cavity increases to make the first fasteners and the second fasteners move toward each other. A plurality of top screw assemblies for limiting the first fasteners and the second fasteners to be placed at the inner end of the cavity are installed around the side of the central body. The present invention provides a cavity on the central body and movably arranges a plurality of first fasteners and second fasteners on the upper and lower sides of the central body. When in use, the pressure of the cavity is increased and the first fasteners and the second fasteners are forced to move toward each other, which can ensure that the fastener load on the final adapter is balanced, has high safety performance, and this installation method is not limited by the size of the inlet, is easy to install, and can greatly speed up the installation speed.

Description

Technical Field

[0001] The present invention relates to the technical field of adapters, and in particular to a load-balanced flange adapter and a locking method. Background Art

[0002] The connection between the blowout preventer at the wellhead of oil drilling and repair or the drilling spool and the casing head all uses bolts to connect the upper and lower flanges. A hammer wrench needs to be used on site, which can easily injure the operator; the installation takes a long time; the bolt load is uneven; the load is wasted (most of the torque is used to overcome thread friction); and manually tightening the bolts will cause uneven load on the adapter load surface, and long-term safety cannot be guaranteed, and the thread surface may bite and stick; in wellheads with high explosion-proof requirements, since a hammer wrench needs to be used to install the wellhead, the operator hits it with a hammer, which inevitably generates sparks and cannot achieve wellhead explosion-proofing; at the same time, when the space of a specific wellhead is limited, wellhead installation is very difficult. Summary of the Invention

[0003] The purpose of the present invention is to provide a flange adapter with balanced load and a locking method to solve the defects in the prior art that cause uneven surface load during adapter installation, sparks are inevitably generated when the installation operator hammers the nut, the safety level is extremely poor, and the limited opening space makes installation very difficult.

[0004] To achieve the above-mentioned purpose, the present invention is implemented by adopting the following technical solutions: a flange adapter with balanced load, comprising a central body with a through middle, a cavity axially arranged in the central body, the pressure in the cavity is adjustable, and a plurality of first fasteners and second fasteners are movably installed on the upper and lower sides of the central body in sequence. The pressure in the cavity increases to make the first fasteners and the second fasteners move toward each other, and a plurality of top screw assemblies for limiting the first fasteners and the second fasteners to be placed at the inner end of the cavity are installed around the side of the central body.

[0005] The central body includes a detachably connected gland and a shell. The shell is provided with an annular recessed groove on one side facing the gland. The gland covers the recessed groove and is fastened with bolts to form a cavity.

[0006] The first fasteners are movably mounted in a circular array on the top surface of the central body, and the second fasteners are movably mounted in a corresponding circular array on the bottom surface of the central body.

[0007] The first fastener comprises a first screw rod which is provided with a gap passing through the top surface of the central body, and one end of the first screw rod which is placed in the cavity is connected to a piston ring;

[0008] The second fastener includes a second screw rod with a gap passing through the bottom surface of the central body. One end of the second screw rod placed in the cavity is also connected to a piston ring. The first screw rod and the second screw rod placed outside the central body are both threadedly fitted with nuts.

[0009] The top screw assembly includes a top screw cover radially installed on the side wall of the center body, the top screw cover is threadedly connected to the cavity, the top screw cover is movably installed with a top screw, and the top screw is placed in one end of the cavity and is rotatably installed with a locking block, the piston ring is matched with a locking bevel, and the locking block is placed in the locking bevel to limit the piston ring.

[0010] A pressure inlet valve and a pressure relief valve are installed on the housing. The pressure inlet valve and the pressure relief valve are connected to the cavity through a hydraulic channel. The two ports of the hydraulic channel connecting the cavity are placed in the area between the corresponding piston ring and the bottom wall or top wall of the cavity adjacent to it.

[0011] A locking method for a flange adapter based on the above-mentioned balanced load comprises the following steps:

[0012] 1) Insert the first screw through the mounting hole on the BOP or wellhead assembly and manually tighten the nut. Insert the second screw through the mounting hole on the casing head or wellhead spool and manually tighten the nut.

[0013] 2) Close the pressure relief valve and apply pressure to the inlet valve. The upper and lower piston rings then move toward each other, generating force on the corresponding first and second screws, the corresponding blowout preventer, and the wellhead spool.

[0014] 3) When the rated pressure is reached in the cavity, turn the jackscrew to drive the locking block to be placed in the locking bevel to fix the piston ring.

[0015] 4) Finally, open the pressure relief valve to release the pressure in the cavity. The flange adapter is now installed.

[0016] According to the above technical solution, the present invention has the following effects:

[0017] The present invention provides a cavity on the central body, and movably arranges a plurality of first fasteners and second fasteners on the central body. When in use, the pressure of the cavity is increased and the first fasteners and the second fasteners are forced to move toward each other. At this time, the process is a uniform tightening and installation process of the first fasteners and the second fasteners corresponding to the connection parts. The top screw assembly is used to limit the piston rings on the first fasteners and the second fasteners. After the pressure is released, since the first fasteners and the second fasteners are placed in the same cavity, the load of the fasteners on the final adapter can be guaranteed to be balanced, the safety performance is high, and this installation method is not limited by the size of the inlet, the installation is convenient, and the installation speed can be greatly accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0019] Figure 2 for Figure 1 AA direction cross-sectional view;

[0020] Figure 3 A top view of the present invention;

[0021] Figure 4 for Figure 3 Cross-sectional view in the middle BB direction;

[0022] Figure 5 for Figure 4 Enlarged view of point A in the middle;

[0023] Among them: 1 housing, 2 gland, 3 screw assembly, 4 first screw, 5 second screw, 6 cavity, 7 piston ring, 8 hydraulic channel, 9 pressure inlet valve, 10 pressure relief valve, 11 locking block, 12 screw gland, 13 locking screw, 14 sealing ring. Implementation Method

[0024] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0025] like Figures 1 to 5 As shown, the present invention discloses a flange adapter with balanced load, comprising a central body with a through center, a cavity 6 axially arranged in the central body, the pressure in the cavity 6 is adjustable, and a plurality of first fasteners and second fasteners are movably mounted on the upper and lower sides of the central body in sequence, the pressure in the cavity 6 increases so that the first fasteners and the second fasteners move toward each other, and a plurality of top screw assemblies 3 for limiting the first fasteners and the second fasteners to be placed at the inner end of the cavity (6) are mounted around the side surface of the central body.

[0026] When in use, it is only necessary to connect the first fastener and the second fastener to the flange of the corresponding device, and by pressurizing the cavity 6 (in this embodiment, by adding hydraulic oil), the first fastener and the second fastener are pushed toward each other, and then the installation of the docking device is locked.

[0027] The observation Figure 3 , it can be seen in the figure that the first fasteners are movably mounted on the top surface of the center body in a circular array, and the second fasteners are movably mounted on the bottom surface of the center body in a corresponding circular array. This arrangement can further balance the load when the fasteners are finally installed. Figure 4 , gives the specific structure of the fastener in the embodiment, the first fastener includes a first screw 4 that is gap-through the top surface of the central body, and one end of the first screw 4 placed in the cavity 6 is connected to a piston ring 7;

[0028] The second fastener includes a second screw 5 with a gap passing through the bottom surface of the central body. One end of the second screw 5 placed in the cavity 6 is also connected to a piston ring 7. The first screw 4 and the second screw 5 are placed on the rod body outside the central body and are threadedly fitted with nuts. In order to ensure the airtightness of the device during production, a sealing ring 14 is set between the piston ring 7 and the cavity 6.

[0029] Observation attachment Figure 5 The jackscrew assembly in this embodiment specifically includes a jackscrew cover 12 radially installed on the side wall of the center body. The jackscrew cover 12 is threadedly connected to the cavity 6, and a sealing ring 14 is installed in the cavity 6. The jackscrew cover 12 is movably equipped with a jackscrew rod 13, and the jackscrew rod 13 is placed in the cavity 6 and is rotatably equipped with a locking block 11 at one end; in addition, the end of the jackscrew rod 13 extending into the jackscrew cover 12 is a smooth cylinder, and a sealing ring is also installed on the cylinder.

[0030] The piston ring 7 is matched with a locking bevel, and the locking block 11 is placed in the locking bevel to limit the piston ring 7. When in use, rotating the top screw 13 can drive the locking block 11 to move radially back and forth, and then control the locking block 11 to plug into the corresponding locking bevel on the piston ring 7. A pressure inlet valve 9 and a pressure relief valve 10 are installed on the housing 1. The pressure inlet valve 9 and the pressure relief valve 10 are connected to the cavity 6 through a hydraulic channel 8. The two ports of the hydraulic channel 8 connecting to the cavity 6 are placed in the area between the corresponding piston ring 7 and the bottom wall or top wall of the cavity 6 adjacent to it; when pressurized, the pressure can push the first screw 4 and the second screw 5 to move toward each other.

[0031] In order to facilitate the installation of parts, the center body is installed in a combined manner. The center body includes a detachably connected pressure cover 2 and a shell 1. The shell 1 is provided with an annular groove on the side facing the pressure cover 2. The pressure cover 2 covers the groove and is fastened by bolts to form a cavity 6. During manufacturing, the edge of the through hole of the shell 1 protrudes outward in the circumferential direction to facilitate the installation of the sealing ring 14, so as to facilitate the installation of the pressure cover 2. After assembly, the sealing of the cavity is more stable.

[0032] Specific use:

[0033] 1) First, insert the first screw rod 4 through the mounting hole on the BOP or wellhead assembly and manually tighten the nut. Insert the second screw rod 5 through the mounting hole on the casing head or wellhead spool and manually tighten the nut to achieve the initial connection between the adapter and the two connection ends.

[0034] 2) Close the pressure relief valve 10 and apply pressure to the pressure inlet valve 9. The upper and lower piston rings 7 then move toward each other, generating a force on the corresponding first screw 4, second screw 5, and the corresponding blowout preventer and wellhead spool.

[0035] 3) When the rated pressure value is reached in the cavity 6, the jackscrew 13 is rotated to drive the locking block 11 to be placed in the locking bevel to fix the piston ring 7. At this time, the piston ring 7 is firmly locked in the longitudinal direction;

[0036] 4) Finally, open the pressure relief valve 10 to release the pressure in the cavity 6. At this point, the flange adapter is installed. The adapter is stressed and loaded evenly after installation. No wrenches or other tools are required for installation, which reduces the operating space required for installation and makes the installation more stable, safe, and quick.

[0037] 5) When disassembling the device, close the pressure relief valve 10 and increase the pressure through the pressure inlet valve 9. The pressure should be higher than the rated working pressure (5-10Mpa). The specific pressure should be determined according to the actual situation on site. After reaching the pressure, maintain the pressure and manually loosen the top screw 13 in the top screw assembly 3 to drive the locking block 11 to move backward, release the lock on the piston ring 7, and release the pressure. The piston ring 7 moves to both ends after losing the pressure and the restriction of the locking block 7. Manually remove the nuts on the first screw 4 and the second screw 5, and the device is disassembled.

[0038] It is understood from common technical knowledge that the present invention may be implemented by other embodiments that do not depart from its spirit or essential features. Therefore, the embodiments disclosed above are, in all respects, merely illustrative and not exclusive. All modifications within the scope of the present invention or equivalent to the scope of the present invention are intended to be encompassed by the present invention.

Claims

1. A load-balanced flange adapter, characterized in that: The invention comprises a central body with a through-hole in the middle, a cavity (6) is circumferentially arranged in the central body, the pressure in the cavity (6) is adjustable, and a plurality of first fasteners and second fasteners are movably mounted on the upper and lower sides of the central body in sequence, the pressure in the cavity (6) increases so as to cause the first fasteners and the second fasteners to move toward each other, and a plurality of top screw assemblies (3) for limiting the first fasteners and the second fasteners to be placed in the inner end of the cavity (6) are mounted around the side of the central body; The first fastener circumferential array is movably mounted on the top surface of the center body, and the second fastener circumferential array is movably mounted on the bottom surface of the center body; The first fastener comprises a first screw (4) which is provided through a gap on the top surface of the central body, and one end of the first screw (4) which is placed in the cavity (6) is connected to a piston ring (7); the second fastener comprises a second screw (5) which is provided through a gap on the bottom surface of the central body, and one end of the second screw (5) which is placed in the cavity (6) is also connected to a piston ring (7), and nuts are threadedly mounted on the rod bodies of the first screw (4) and the second screw (5) which are placed outside the central body; The top screw assembly (3) includes a top screw cover (12) radially mounted on the side wall of the center body, the top screw cover (12) is threadedly connected to the cavity (6), the top screw cover (12) is movably mounted with a top screw (13), and the top screw (13) is threadedly connected to one end of the cavity (6) and is mounted with a locking block (11), the piston ring (7) is matched with a locking bevel, and the locking block (11) is placed on one side of the locking bevel to limit the piston ring (7).

2. A load-balanced flange adapter according to claim 1, characterized in that: The central body comprises a detachably connected gland (2) and a shell (1); the shell (1) is provided with an annular recessed groove on one side facing the gland (2); the gland (2) covers the recessed groove and is fastened to the shell by bolts to form a cavity (6).

3. The load-balancing flange adapter according to claim 2, characterized in that: A pressure inlet valve (9) and a pressure relief valve (10) are installed on the housing (1). The pressure inlet valve (9) and the pressure relief valve (10) are connected to the cavity (6) via a hydraulic flow channel (8). The two ports of the hydraulic flow channel (8) connected to the cavity (6) are placed in the area between the corresponding piston ring (7) and the bottom wall or top wall of the cavity (6) adjacent thereto.

4. A locking method for a flange adapter with balanced load according to claim 3, characterized in that: The following steps are involved: 1) Insert the first screw (4) through the mounting hole on the blowout preventer or the wellhead device and manually tighten the nut, insert the second screw (5) through the mounting hole on the casing head or the wellhead spool and manually tighten the nut; 2) Close the pressure relief valve (10) and apply pressure to the pressure inlet valve (9). At this time, the upper and lower piston rings (7) move toward each other, causing the corresponding first screw (4), second screw (5) and the corresponding blowout preventer and wellhead cross-piece to generate a force; 3) When the rated pressure value is reached in the cavity (6), the top screw (13) is rotated to drive the locking block (11) to be placed on the side of the locking bevel to fix the piston ring (7); 4) Finally, open the pressure relief valve (10) to release the pressure in the cavity (6). At this time, the flange adapter is installed.

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