Rotating assembly for quick disassembly and installation of seals

Abstract

The present invention discloses a rotating assembly device with a seal that can be quickly disassembled and assembled, and relates to the technical field of rotating assemblies of underbalanced drilling rotary blowout preventers, including a driver sleeve, a rubber core cup, a seal, and a rubber core. The surface of the driver sleeve is provided with a seal, and the driver sleeve forms a seal with the rubber core cup through the seal, and a fastener is provided between the driver sleeve and the rubber core cup, and the driver sleeve and the rubber core cup are connected as a whole through the fastener. The seal and the fastener work together to achieve rapid disassembly and assembly while ensuring the sealing performance. Effective sealing is achieved between the rubber core cup and the rubber core, between the driver sleeve and the rubber core, and between the rubber core cup and the driver sleeve through a multi-layer sealing structure. The special-shaped protrusions and the labyrinth sealing structure increase the complexity and resistance of the fluid flow and reduce leakage. The self-locking mechanism of the fastener simplifies the installation and disassembly process, avoiding the difficulty of disassembly and cleaning caused by the traditional trapezoidal thread connection method.

Description

Technical Field

[0001] The invention relates to the technical field of a rotary assembly of an underbalanced drilling rotary blowout preventer, in particular to a rotary assembly device capable of quickly disassembling and assembling a sealing element. Background Art

[0002] The rotary blowout preventer is a key device used in the oil and gas drilling industry to prevent blowouts. Its main function is to maintain well control during drilling, prevent drilling fluid or oil and gas from escaping from the wellhead when the drill pipe rotates, and ensure that the drill pipe can rotate freely for normal drilling operations. The rotary blowout preventer is usually installed above the top drive system or turntable, located at the wellhead of the drilling platform. At present, underbalanced drilling technology has been developed and mature, and its effects in discovering and protecting oil and gas formations and increasing drilling speed have also been recognized. With the rapid development of the oil industry, underbalanced drilling technology has been used as a preferred technology in the oil drilling field. At the same time, the country has vigorously promoted environmental remediation, which has put forward higher requirements for production equipment in the oil industry.

[0003] The Chinese patent with publication number CN109577903A discloses an easily detachable rotating blowout preventer rotating assembly, including an upper rubber core connecting seat, an upper rubber core mounting cylinder, a core shaft, an upper dynamic sealing sleeve, a lower dynamic sealing sleeve and a lower rubber core mounting seat; an upper chuck and a lower chuck for fixedly connecting with the upper rubber core are arranged from top to bottom on the outer side of the upper rubber core connecting seat, and the upper chuck is fixedly installed with the top of the upper rubber core mounting cylinder by bolt connection from top to bottom; an upper connecting boss is integrally fixed on the inner side of the top of the upper dynamic sealing sleeve, and the bottom of the upper rubber core mounting cylinder and the upper dynamic sealing sleeve are fixedly installed with the upper connecting boss. The connecting boss and the top of the mandrel are fixedly installed from top to bottom by bolt connection; the lower connecting boss is integrally fixed on the inner side of the bottom of the lower dynamic seal sleeve, and the bottom of the mandrel, the lower connecting boss of the lower dynamic seal sleeve and the lower rubber core mounting seat are fixedly installed from top to bottom by bolt connection; however, a housing is fixedly installed at intervals on the outside of the mandrel, and a bearing assembly located between the upper dynamic seal sleeve and the lower dynamic seal sleeve is fixedly installed between the outside of the mandrel and the inside of the housing, which increases the transportation cost of replacing the rotating assembly, affects the on-site construction, and leads to an increase in the operating cost. Sometimes, in order to avoid the impact of the failure of one rotating assembly on the on-site construction, it is necessary to equip two assemblies at the same time, which reduces the efficiency of the rotating assembly and the rotating blowout preventer.

[0004] The upper part of the conventional rotating assembly is composed of a driver sleeve, eye screws, an upper pressure cover, a rubber core seat, a rubber core cup, a sealing gasket, and a rubber core. The bottom of the rubber core seat is connected to the rubber core, and the rubber core seat forms a seal with the rubber core cup through a sealing gasket. The upper pressure cover fixes the rubber core seat in the rubber core cup through a trapezoidal thread. The upper part of the upper pressure cover is equipped with an eye screw. The driver sleeve is fixed to the rubber core seat through the trapezoidal thread, and the overall structure is complex. Secondly, the mud dropped from the wellhead can easily penetrate into the trapezoidal thread between the upper pressure cover and the rubber core cup and the trapezoidal thread between the driver sleeve and the rubber core seat; after a long time, the mud will solidify and the trapezoidal thread will rust, making it difficult to disassemble. It takes multiple people to use a force rod to turn the rusted trapezoidal thread. If the threaded connection is changed to a bolt connection, a large number of bolts are required to achieve a sealing connection effect, resulting in complicated disassembly steps and inconvenient disassembly and assembly.

[0005] To this end, the present invention proposes a rotating assembly device capable of quickly disassembling and assembling a sealing member to solve the above-mentioned problem. Summary of the invention

[0006] In view of the above problems in the prior art, the present invention is proposed.

[0007] In order to solve the above technical problems, the present invention provides the following technical solutions: a rotating assembly device for quickly disassembling and assembling a seal, which includes a rotating assembly device for quickly disassembling and assembling a seal, including a driver sleeve, a rubber core cup, a seal and a rubber core, the rubber core is located in the inner cavity of the rubber core cup and is installed at the bottom end of the driver sleeve, a seal is arranged on the surface of the driver sleeve, the driver sleeve forms a seal with the rubber core cup through the seal, and a fastener is provided between the driver sleeve and the rubber core cup, and the driver sleeve and the rubber core cup are connected as a whole through the fastener.

[0008] As a preferred solution of the rotating assembly device of the quickly disassembled seal described in the present invention, the rubber core cup includes an outer rubber core layer and an inner rubber core layer which are plug-connected, and the inner wall of the outer rubber core layer protrudes outward with a special-shaped protrusion, and the special-shaped protrusion abuts against the inner wall of the rubber core cup and supports the rubber core.

[0009] As a preferred solution of the rotating assembly device for the quickly disassembled seal of the present invention, the special-shaped protrusion comprises a trapezoidal protrusion and a hook-shaped protrusion connected in an integral manner, the hook-shaped protrusion is fixed at the center of the vertical surface of the trapezoidal protrusion, and an annular groove for positioning the inner rubber core layer is provided at the top of the trapezoidal protrusion;

[0010] The surface of the outer rubber core layer is provided with a plurality of hook grooves for hooking with the hook-shaped protrusions. The plurality of hook grooves are arranged in a circular shape with equal intervals on the inner wall of the outer rubber core layer. The plurality of hook grooves jointly locate the special-shaped protrusions and support the special-shaped protrusions to support the rubber core.

[0011] As a preferred solution of the rotating assembly device with a quickly disassembled seal described in the present invention, the seal includes a lower sealing unit, which is arranged between the inner rubber core layer and the rubber core to form a multi-layer composite sealing structure, and the lower sealing unit includes an outer sealing layer and an inner sealing layer, and a labyrinth sealing structure is formed between the outer sealing layer and the inner sealing layer.

[0012] As a preferred solution of the rotating assembly device with quickly disassembled seals described in the present invention, the outer sealing layer and the inner sealing layer are not in contact with each other, but form a series of regularly arranged throttling gaps, each throttling gap changes irregularly in multiple directions, and an expansion cavity is provided at the peak angle of the throttling gap to hinder the flow of fluid.

[0013] As a preferred solution of the rotating assembly device of the quickly disassembled seal described in the present invention, the seal also includes an upper sealing block, the drive sleeve is pressed against the inner rubber core layer through the upper sealing block, and an annular groove for positioning the upper sealing block is opened on the drive sleeve and the inner sealing layer.

[0014] As a preferred solution of the rotating assembly device for quickly disassembling and assembling the seal as described in the present invention, the fastener includes a lower pressure rod, an upper push rod and a push piece, the lower pressure rod penetrates the inner rubber core layer, the upper sealing block and the driver sleeve, and forms a special-shaped groove with the mouth facing upward inside the lower pressure rod, the upper push rod is rotatably engaged in the special-shaped groove and abuts against the surface of the driver sleeve, and the push piece is rotated and pressed into the upper push rod to be positioned by the upper push rod.

[0015] As a preferred solution of the rotating assembly device for quickly disassembling and assembling the sealing member described in the present invention, the lower pressure rod includes a lower rod head and a lower rod body, a regular rotating groove is provided at the connection between the lower rod head and the lower rod body, and a circular groove with ears runs through the inside of the lower rod body, the circular groove with ears and the rotating groove are connected, the lower rod head of the lower pressure rod is located inside the circular groove, and the lower rod body runs through the inner rubber core layer, the upper sealing block and the driver sleeve to form an action groove.

[0016] As a preferred solution of the rotating assembly device of the quickly disassembled seal described in the present invention, the upper support rod includes an upper rod head, an upper rod shaft and a rectangular ear block, the rectangular ear block is welded to the bottom of the upper rod shaft, the upper rod shaft is inserted and rotated along the circular groove with ear, so that the rectangular ear block is sunken into the rotating groove and abuts against the bottom of the lower rod shaft, the upper rod shaft is sunken into the circular groove with ear and is tightly attached to the lower rod shaft, the upper rod head abuts against the end of the upper rod shaft, and the upper rod head passes through the action groove and extends upward.

[0017] As a preferred solution of the rotating assembly device for quickly disassembling and assembling the seal described in the present invention, the resist includes a pivot fixed to the upper surface of the driver sleeve, and an arc-shaped card is rotated on the surface of the pivot, an arc-shaped opening for engaging the upper rod body is opened at the end of the arc-shaped card, and a plurality of positioning circular holes are opened at the end of the arc-shaped opening, and the upper rod head is immersed in the positioning circular hole to position the resist.

[0018] Beneficial effects of the present invention: The present invention realizes rapid assembly and disassembly while ensuring sealing performance through the synergistic effect of the seal and the fastener. The multi-layer sealing structure is used to achieve effective sealing between the rubber core cup and the rubber core, between the driver sleeve and the rubber core, and between the rubber core cup and the driver sleeve. The special-shaped protrusion and the labyrinth sealing structure increase the complexity and resistance of fluid flow and reduce leakage. The self-locking mechanism of the fastener simplifies the installation and disassembly process, avoiding the difficulty of disassembly and cleaning caused by the traditional trapezoidal thread connection method. At the same time, it also avoids the problem of complex disassembly steps caused by simple bolt connection, which not only improves the reliability and service life of the seal, but also greatly reduces the maintenance cost and operation difficulty. Especially under high-speed rotation conditions, the special-shaped protrusion is jointly positioned and supported by a plurality of equally spaced hook grooves, giving the special-shaped protrusion a uniform support force, thereby ensuring the sealing effect under high-speed rotation conditions; in addition, the throttling gap and expansion cavity formed between the outer sealing layer and the inner sealing layer further enhance the sealing effect, while reducing wear and extending the service life of the seal. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative work.

[0020] Figure 1 It is a schematic diagram of the overall structure of the rotating assembly device of the invention that can quickly disassemble and assemble the sealing member;

[0021] Figure 2 It is an axonometric schematic diagram of the upper structure of the rotating assembly device in the present invention;

[0022] Figure 3 It is a partial structural cross-sectional view of the rotating assembly device in the present invention;

[0023] Figure 4 It is a structural exploded view of the rotating assembly device of the present invention that can quickly disassemble and assemble the sealing member;

[0024] Figure 5It is a partial structural schematic diagram of the rotating assembly device in the present invention;

[0025] Figure 6 For the present invention Figure 5 A magnified view of the structure of part A;

[0026] Figure 7 It is an exploded view of the overall structure of the fastener in the present invention;

[0027] Figure 8 It is an axonometric view of the overall structure of the fastener in the present invention.

[0028] Reference numerals: 100, driver sleeve; 101, annular groove; 200, rubber core cup; 210, outer rubber core layer; 211, hook groove; 212, circular groove; 220, inner rubber core layer; 230, special-shaped protrusion; 231, trapezoidal protrusion; 232, hook-shaped protrusion; 233, annular groove; 300, sealing element; 310, lower sealing unit; 311, outer sealing layer; 3111, inner frame; 3112, elastic silicone membrane; 312, inner sealing layer; 3121, sealing frame; 3122, thin silicone skin; 3 20. Upper sealing block; 400. Rubber core; 500. Fastener; 510. Lower pressure rod; 511. Lower rod head; 512. Lower rod body; 513. Rotation slot; 514. Round slot with ear; 520. Upper push rod; 521. Upper rod head; 5211. Upper end piece; 5212. Lower end piece; 5213. Positioning column; 5214. Center piece; 5215. Spring; 522. Upper rod body; 523. Rectangular ear block; 530. Push piece; 531. Pivot; 532. Arc card; 533. Arc opening; 534. Positioning circular hole. DETAILED DESCRIPTION

[0029] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and easy to understand, the specific implementation methods of the present invention are described in detail below in conjunction with the accompanying drawings.

[0030] In the following description, many specific details are set forth to facilitate a full understanding of the present invention, but the present invention may also be implemented in other ways different from those described herein, and those skilled in the art may make similar generalizations without violating the connotation of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed below.

[0031] Secondly, the term "one embodiment" or "embodiment" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of the present invention. The term "in one embodiment" that appears in different places in this specification does not necessarily refer to the same embodiment, nor does it refer to a separate or selective embodiment that is mutually exclusive with other embodiments.

[0032] Example 1

[0033] Reference Figure 1 to Figure 6 As shown, it is the first embodiment of the present invention, which provides a rotating assembly device for quickly disassembling and assembling a seal, which includes a driver sleeve 100, a rubber core cup 200, a seal 300 and a rubber core 400, wherein the rubber core 400 is located in the inner cavity of the rubber core cup 200 and is installed at the bottom end of the driver sleeve 100, and the surface of the driver sleeve 100 is provided with a seal 300, and the driver sleeve 100 forms a seal with the rubber core cup 200 through the seal 300, and a fastener 500 is provided between the driver sleeve 100 and the rubber core cup 200, and the driver sleeve 100 and the rubber core cup 200 are connected as a whole through the fastener 500.

[0034] Among them, Figure 3 , Figure 5 as well as Figure 6 As shown, the core cup 200 includes an outer core layer 210 and an inner core layer 220 which are plug-connected. A special-shaped protrusion 230 protrudes outward from the inner wall of the outer core layer 210 . The special-shaped protrusion 230 abuts against the inner wall of the core cup 200 and supports the core 400 .

[0035] Specifically, the special-shaped protrusion 230 includes a trapezoidal protrusion 231 and a hook-shaped protrusion 232 which are connected in an integral manner. The hook-shaped protrusion 232 is fixed at the center of the vertical surface of the trapezoidal protrusion 231, and an annular groove 233 for positioning the inner rubber core layer 220 is provided on the top of the trapezoidal protrusion 231, and a hook groove 211 for hooking the hook-shaped protrusion 232 is provided on the surface of the outer rubber core layer 210. The number of the hook grooves 211 is multiple, and the multiple hook grooves 211 are multiple. The hook grooves 211 are arranged in a circular shape at equal intervals on the inner wall of the outer rubber core 400. When the rotating assembly device moves at high speed along with the rotating rod, the high-speed moving rotating rod will drive the special-shaped protrusion 230 to rotate. The movement trend caused by the synchronous rotation of the special-shaped protrusion 230 is suppressed by multiple equally spaced but unconnected hook grooves 211 to ensure that the position is fixed. The multiple hook grooves 211 jointly position the special-shaped protrusion 230 and support the special-shaped protrusion 230, giving the special-shaped protrusion 230 a uniform supporting force.

[0036] like Figure 5 As shown, the seal 300 includes a lower sealing unit 310, which is arranged between the inner rubber core layer 220 and the rubber core 400 to form a multi-layer composite sealing structure. The lower sealing unit 310 includes an outer sealing layer 311 and an inner sealing layer 312, and an efficient labyrinth sealing structure is formed between the outer sealing layer 311 and the inner sealing layer 312.

[0037] The outer sealing layer 311 is adhered to the inner wall of the inner rubber core layer 220, and is composed of an inner skeleton 3111 and an elastic silicone film 3112 that is tightly attached to the surface. The elastic silicone film 3112 has good temperature resistance and anti-aging properties, can adapt to a wide range of temperature changes, and maintain good elasticity during long-term use. The inner skeleton 3111 of the outer sealing layer 311 provides the necessary support to ensure that the outer sealing layer 311 can maintain a stable geometric shape under different working conditions to avoid deformation caused by mechanical stress.

[0038] The inner sealing layer 312 includes a sealing frame 3121 and a thin layer of silicone skin 3122 attached to its surface. The sealing frame 3121 provides a basic structure for the inner sealing layer 312, ensuring that the inner sealing layer 312 can be accurately embedded in the rubber core cup 200 in the working state. The installation method is to press the inner sealing layer 312 so that it deforms due to pressure and snaps into the inside of the rubber core cup 200. As a material that directly contacts the rubber core cup 200, the thin layer of silicone skin 3122 has a smooth surface and excellent sealing performance, and can still maintain a good sealing effect under a high pressure difference environment. In addition, the thin layer of silicone skin 3122 can deform within a certain range to adapt to the slight unevenness of the inner wall of the rubber core cup 200, thereby improving the reliability of the overall sealing.

[0039] The outer sealing layer 311 and the inner sealing layer 312 do not contact each other, but form a series of regularly arranged throttling gaps. When the fluid or gas passes through these throttling gaps, the direction is passively changed, which increases the length and complexity of the flow path of the fluid, thereby significantly increasing the flow resistance of the fluid and reducing the leakage rate of the fluid. In particular, expansion cavities are designed at the bends of the throttling gaps, which will produce local pressure drops when the fluid passes through, further enhancing the sealing effect.

[0040] In order to ensure the stability of the position of the inner sealing layer 312, an upper ring groove and a side groove are provided on the top and side of the rubber core 400. The upper ring groove is not only used to clamp the inner sealing layer 312, but also gives the inner sealing layer 312 a certain pulling force, which helps to locate the position of the inner sealing layer 312. The inner sealing layer 312 abuts against the side groove, further fixing the position of the inner sealing layer 312. The side groove and the upper ring groove act together on the inner sealing layer 312 to prevent it from moving outward due to centrifugal force, ensuring that the inner sealing layer 312 can still maintain a stable position under high-speed rotation conditions without offset or detachment.

[0041] In addition, the special-shaped protrusion 230 is positioned to support the rubber core 400 and is tightly attached to the rubber core 400 to form a seal. The special-shaped protrusion 230 and the lower sealing unit 310 cooperate to form a multiple sealing effect.

[0042] Example 2

[0043] Reference Figure 3~Figure 7 As shown, it is a second embodiment of the present invention, which is based on the previous embodiment, except that the seal 300 also includes an upper sealing block 320, and the driver sleeve 100 is pressed against the inner rubber core layer 220 through the upper sealing block 320, and an annular groove 101 for positioning the upper sealing block 320 is opened on the driver sleeve 100 and the inner sealing layer 312. Specifically, the upper sealing block 320 cooperates with the driver sleeve 100 and the inner rubber core layer 220 to further enhance the stability of the entire sealing system, optimize the overall structure of the seal 300, and make it more compact and efficient.

[0044] The upper sealing block 320 is a two-piece symmetrical structure, which is formed into an integral annular body by the cooperation of the driver sleeve 100, the inner sealing layer 312 and the rubber core 400, and is positioned by a fastener 500.

[0045] In addition, the upper sealing block 320 is a double-layer composite structure, the inner layer of which is a skeleton and the outer layer is covered with silicone, which has a certain support while ensuring the sealing function.

[0046] A circular groove 212 for placing a fastener 500 is provided at the top end of the outer rubber core layer 210. The fastener 500 is installed in the circular groove 212. The fastener 500 includes a lower pressure rod 510, an upper push rod 520 and a push piece 530. The lower pressure rod 510 passes through the inner rubber core layer 220, the upper sealing block 320 and the driver sleeve 100, and forms a special-shaped groove with an upward mouth inside the lower pressure rod 510. The upper push rod 520 is rotatably engaged in the special-shaped groove and abuts against the surface of the driver sleeve 100. The push piece 530 is rotatably pressed into the upper push rod 520 and is positioned by the upper push rod 520.

[0047] Among them, the lower pressure rod 510 includes a lower rod head 511 and a lower rod shaft 512, a regular rotation groove 513 is opened at the connection between the lower rod head 511 and the lower rod shaft 512, and a circular groove 514 with ears passes through the lower rod shaft 512, the circular groove 514 with ears is connected to the rotation groove 513, the lower rod head 511 of the lower pressure rod 510 is located inside the circular groove 212, and the lower rod shaft 512 passes through the inner rubber core layer 220, the upper sealing block 320 and the driver sleeve 100 to form an action groove.

[0048] The upper support rod 520 includes an upper rod head 521, an upper rod shaft 522 and a rectangular ear block 523, wherein the rectangular ear block 523 is welded to the bottom of the upper rod shaft 522, and the upper rod shaft 522 is inserted and rotated along the circular groove with ear 514 so that the rectangular ear block 523 is sunken into the rotating groove 513 and abuts against the bottom of the lower rod shaft 512, and the upper rod shaft 522 is sunken into the circular groove with ear 514 and is tightly attached to the lower rod shaft 512, and the upper rod head 521 abuts against the end of the upper rod shaft 522, and the upper rod head 521 passes through the action groove and extends upward.

[0049] The upper rod head 521 includes two stacked end pieces, the upper rod body 522 penetrates through the two end pieces and fixes the two end pieces, a telescopic member is provided between the two end pieces, and the abutment member 530 is squeezed by the telescopic member.

[0050] Specifically, the two end pieces are respectively an upper end piece 5211 and a lower end piece 5212 according to their positions. A plurality of positioning posts 5213 are welded at the position of the upper end piece 5211 facing the lower end piece 5212 , and the plurality of positioning posts 5213 are evenly spaced and distributed on the lower surface of the upper end piece 5211 .

[0051] Specifically, the telescopic member includes a center piece 5214 of the same size as the end piece, and a spring 5215 is fixedly connected to one end of the center piece 5214 away from the positioning column 5213. By pressing the center piece 5214, the spring 5215 is expanded and contracted to change the distance between the center piece 5214 and the lower end piece 5212.

[0052] The resisting member 530 includes a pivot 531 fixed to the upper surface of the driver sleeve 100, and an arc-shaped card 532 is rotated on the surface of the pivot 531, an arc-shaped opening 533 for engaging the upper rod 522 is opened at the end of the arc-shaped card 532, and a plurality of positioning circular holes 534 are opened at the end of the arc-shaped opening 533, and the positioning column 5213 is immersed in the positioning circular hole 534.

[0053] Specifically, first, the lower pressure rod 510 is placed upside down in the circular groove 212 of the outer rubber core layer 210. After the position of the lower pressure rod 510 is ensured, the inner rubber core layer 220, the upper sealing block 320 and the driver sleeve 100 are installed in sequence according to the position of the lower rod body 512, so that the lower rod body 512 is sunk into the action groove and inserted into and rotated inside the lower pressure rod 510.

[0054] At this time, the upper rod 522 of the upper push rod 520 is inserted into the eared circular groove 514 of the lower rod 512, and the rectangular ear block 523 is sunk into the rotating groove 513 by rotation. During the rotation process, it is necessary to ensure that the rectangular ear block 523 is completely in contact with the bottom of the lower rod 512 to ensure the stability of the upper push rod 520.

[0055] By adjusting the telescopic part, the spring 5215 is in a contracted state, the distance between the center piece 5214 and the upper end piece 5211 is increased, and the abutment 530 on the upper surface of the driver sleeve 100 is rotated so that the arc card 532 rotates around the vertical center of the pivot 531. The arc card 532 is inserted into the slit between the center piece 5214 and the upper end piece 5211, and the arc opening 533 at the end of the arc card 532 is adapted to the upper rod body 522.

[0056] At the same time, the upper end piece 5211 is loosened so that the plurality of positioning posts 5213 on the surface of the upper end piece 5211 are inserted into the positioning circular holes 534 on the surface of the arc-shaped card 532 to ensure the stability of the abutment 530 .

[0057] The present invention utilizes the spring 5215, the arc-shaped card 532 and the positioning column 5213 to cooperate with each other, so that the fastener 500 produces a self-locking effect. The fastener 500 can be disassembled and installed by simple pulling and rotating actions, which simplifies the difficulty and steps of installation and disassembly, solves the problem of difficult disassembly and assembly of the seal in the rotating assembly of the existing underbalanced drilling rotary blowout preventer, and has a simple structure and is safe and reliable.

[0058] In a conventional rotating assembly device, the upper part of the conventional rotating assembly device includes a drive sleeve, an upper pressure cover, a rubber core seat and a rubber core cup. The upper pressure cover fixes the rubber core seat in the rubber core cup through a trapezoidal thread, and the drive sleeve is fixed to the rubber core seat through the trapezoidal thread. The mud dropped from the wellhead penetrates into the trapezoidal thread. After a long time, the mud will solidify and the trapezoidal thread will rust, making it difficult to remove the upper dynamic seal and the lower dynamic seal. Multiple people are required to use a force rod to rotate the rusted trapezoidal thread. The operation is complicated and difficult. In addition, it takes a certain amount of time to clean the mud on the surface of the trapezoidal thread after solidification, and the structure of the trapezoidal thread leads to problems such as difficulty in cleaning and low cleaning efficiency.

[0059] The device uses multiple fasteners 500 to work together to reduce the force required for disassembly and installation of the fasteners 500 without the need for tools. In addition, the traditional trapezoidal thread connection method is changed to avoid the problem of difficult disassembly and cleaning caused by mud infiltration.

[0060] In addition, the upper sealing block 320, the outer sealing layer 311 and the inner sealing layer 312 of the device are all connected by snapping, and work together with the driver sleeve 100, the rubber core cup 200 and the rubber core 400 to achieve multiple effective seals between the rubber core cup 200 and the rubber core 400, between the driver sleeve 100 and the rubber core 400, and between the rubber core cup 200 and the driver sleeve 100, so that mud is difficult to penetrate. Secondly, a labyrinth sealing structure is formed between the outer sealing layer 311 and the inner sealing layer 312, and the working surfaces of the outer sealing layer 311 and the inner sealing layer 312 do not contact each other, so as to reduce the wear between the outer sealing layer 311 and the inner sealing layer 312 and extend the service life of the seal 300. At the same time, a series of regularly arranged throttling gaps are formed between the seals 300, and expansion cavities are designed at the turning points of the throttling gaps. These cavities will produce local pressure drops when the fluid passes through, further enhancing the sealing effect.

[0061] The present invention achieves rapid assembly and disassembly while ensuring sealing performance through the design of the seal 300 and the fastener 500. The multi-layer sealing structure is used to effectively seal between the rubber core cup 200 and the rubber core 400, between the driver sleeve 100 and the rubber core 400, and between the rubber core cup 200 and the driver sleeve 100. The special-shaped protrusion 230 and the labyrinth sealing structure increase the complexity and resistance of fluid flow and reduce leakage. The fastener 500 simplifies the installation and disassembly process through the self-locking mechanism, avoiding the difficulty of disassembly and cleaning caused by the traditional trapezoidal thread connection method. The overall design not only improves the reliability and service life of the seal 300, but also greatly reduces the maintenance cost and operation difficulty.

[0062] Working principle: First, hook the special-shaped protrusion 230 at the top of the outer rubber core layer 210, and press the inner sealing layer 312 to make it deform due to pressure and fit inside the rubber core 400. Press the inner sealing layer 312 so that all parts of the inner sealing layer 312 are close to the surface wall of the rubber core cup 200, and insert the outer rubber core layer 210 along the direction of the rubber core 400 so that the special-shaped protrusion 230 at the bottom of the outer rubber core layer 210 is close to the rubber core 400. In this process, the outer sealing layer 311 adheres to the inner wall of the inner rubber core layer 220, but the outer sealing layer 311 will be blocked by the inner sealing layer 312 as it moves up with the inner rubber core layer 220. Use a wooden stick to press the position where the outer sealing layer 311 and the inner sealing layer 312 are blocked, so that the outer sealing layer 311 can move up smoothly.

[0063] When the special-shaped protrusion 230 at the bottom of the outer rubber core layer 210 is tightly attached to the rubber core 400, the two-piece upper sealing block 320 is put on the driver sleeve 100, and the lower pressure rod 510 is placed upside down in the circular groove 212 of the outer rubber core layer 210. According to the position of the lower rod body 512, the inner rubber core layer 220, the upper sealing block 320 and the driver sleeve 100 are installed in sequence.

[0064] Insert the upper shaft 522 of the upper push rod 520 into the eared circular groove 514 of the lower shaft 512, and rotate the rectangular ear block 523 to sink into the rotating groove 513 to ensure the stable connection of the upper push rod 520. Adjust the spring 5215 so that the spring 5215 is in a contracted state, increase the distance between the center piece 5214 and the upper end piece 5211, and rotate the push piece 530 on the upper surface of the driver sleeve 100 so that the arc-shaped card 532 rotates around the vertical center of the pivot 531 and is inserted into the slit between the center piece 5214 and the upper end piece 5211. At the same time, loosen the upper end piece 5211 so that the multiple positioning columns 5213 on the surface of the upper end piece 5211 are inserted into the positioning circular holes 534 on the surface of the arc-shaped card 532 to ensure the stability of the push piece 530 and complete assembly.

[0065] Among them, when the rotating assembly device moves at high speed with the rotating rod, the high-speed rotating rod will drive the special-shaped protrusion 230 to rotate synchronously, and the special-shaped protrusion 230 is stationary relative to the rubber core cup 200. A plurality of equally spaced hook grooves 211 jointly position the special-shaped protrusion 230 and support the special-shaped protrusion 230, giving the special-shaped protrusion 230 a uniform supporting force to support the rubber core 400.

[0066] The lower sealing unit 310 is disposed between the inner rubber core layer 220 and the rubber core 400 to form a multi-layer composite sealing structure. The throttling gap and expansion cavity formed between the outer sealing layer 311 and the inner sealing layer 312 increase the complexity and resistance of the fluid flow and reduce the leakage rate of the fluid.

[0067] The lower pressure rod 510 penetrates the inner rubber core layer 220, the upper sealing block 320 and the driver sleeve 100, and forms a special-shaped groove inside for installing the upper push rod 520. The rectangular ear block 523 is rotated and inserted into the rotation groove 513 of the lower pressure rod 510 to ensure the stable connection of the upper push rod 520. The positioning column 5213 is inserted into the positioning circular hole 534 by the push piece 530 rotating around the pivot 531 to achieve the locking of the fastener 500. At the same time, the rubber core cup 200, the special-shaped protrusion 230 and the upper sealing block 320 work together to stabilize the connection between the rubber core cup 200, the driver sleeve 100 and the rubber core 400.

[0068] It should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present invention may be modified or replaced by equivalents without departing from the spirit and scope of the technical solutions of the present invention, which should all be included in the scope of the claims of the present invention.

Claims

1. A rotating assembly device for quickly disassembling and assembling a sealing member, comprising a driver sleeve (100), a rubber core cup (200), a sealing member (300) and a rubber core (400), characterized in that: The rubber core (400) is located in the inner cavity of the rubber core cup (200) and is installed at the bottom end of the driver sleeve (100); a sealing member (300) is arranged on the surface of the driver sleeve (100); the driver sleeve (100) forms a seal with the rubber core cup (200) through the sealing member (300); a fastener (500) is provided between the driver sleeve (100) and the rubber core cup (200); and the driver sleeve (100) and the rubber core cup (200) are connected as a whole through the fastener (500); The rubber core cup (200) comprises an outer rubber core layer (210) and an inner rubber core layer (220) which are plug-connected, and an irregularly shaped protrusion (230) protrudes outward from the inner wall of the outer rubber core layer (210), and the irregularly shaped protrusion (230) abuts against the inner wall of the rubber core cup (200) and supports the rubber core (400); The special-shaped protrusion (230) comprises a trapezoidal protrusion (231) and a hook-shaped protrusion (232) connected in an integral manner, the hook-shaped protrusion (232) is fixed at the center of the vertical surface of the trapezoidal protrusion (231), and an annular groove (233) for positioning the inner rubber core layer (220) is provided on the top of the trapezoidal protrusion (231); The surface of the outer rubber core layer (210) is provided with a plurality of hook grooves (211) for hooking with the hook-shaped protrusions (232); the plurality of hook grooves (211) are arranged in a circular shape at equal intervals on the inner wall of the outer rubber core layer (210); the plurality of hook grooves (211) jointly locate the special-shaped protrusions (230) and support the special-shaped protrusions (230) to support the rubber core (400); The sealing element (300) comprises a lower sealing unit (310), the lower sealing unit (310) being arranged between the inner rubber core layer (220) and the rubber core (400) to form a multi-layer composite sealing structure, the lower sealing unit (310) comprising an outer sealing layer (311) and an inner sealing layer (312), a labyrinth sealing structure being formed between the outer sealing layer (311) and the inner sealing layer (312); The fastener (500) comprises a lower pressing rod (510), an upper pushing rod (520) and a pushing piece (530); a special-shaped groove with an opening facing upward is formed inside the lower pressing rod (510); the upper pushing rod (520) is rotatably engaged in the special-shaped groove and abuts against the surface of the driver sleeve (100); and the pushing piece (530) is rotatably pressed inside the upper pushing rod (520) and positioned by the upper pushing rod (520).

2. The rotating assembly device for quickly disassembling a seal according to claim 1, characterized in that: The outer sealing layer (311) and the inner sealing layer (312) are not in contact with each other, but form a series of regularly arranged throttling gaps, each of which changes in irregular directions, and an expansion cavity is provided at the peak angle of the throttling gap to hinder the flow of fluid.

3. The rotating assembly device for quickly disassembling a seal according to claim 2, characterized in that: The sealing member (300) further comprises an upper sealing block (320), the driver sleeve (100) is pressed against the inner rubber core layer (220) via the upper sealing block (320), and an annular groove (101) for positioning the upper sealing block (320) is provided on the driver sleeve (100) and the inner sealing layer (312).

4. The rotating assembly device for quickly disassembling a seal as claimed in claim 3, characterized in that: The lower pressure rod (510) penetrates the inner rubber core layer (220), the upper sealing block (320) and the driver sleeve (100).

5. The rotating assembly device for quickly disassembling a seal according to claim 4, characterized in that: The lower pressure rod (510) comprises a lower rod head (511) and a lower rod body (512); a regular rotation groove (513) is provided at the connection between the lower rod head (511) and the lower rod body (512); and a circular groove with an ear (514) passes through the interior of the lower rod body (512); the circular groove with an ear (514) and the rotation groove (513) are connected; the lower rod head (511) of the lower pressure rod (510) is located inside the circular groove (212); and the lower rod body (512) passes through the inner rubber core layer (220), the upper sealing block (320) and the driver sleeve (100) to form an action groove.

6. The rotating assembly device for quickly disassembling a seal according to claim 5, characterized in that: The upper support rod (520) comprises an upper rod head (521), an upper rod shaft (522) and a rectangular ear block (523); the rectangular ear block (523) is welded to the bottom of the upper rod shaft (522); the upper rod shaft (522) is inserted along the ear-shaped circular groove (514) and rotated, so that the rectangular ear block (523) is sunk into the rotation groove (513) and abuts against the bottom of the lower rod shaft (512); the upper rod shaft (522) is sunk into the ear-shaped circular groove (514) and is tightly attached to the lower rod shaft (512); the upper rod head (521) abuts against the end of the upper rod shaft (522); the upper rod head (521) passes through the action groove and extends upward.

7. The rotating assembly device for a quickly disassembled seal according to claim 6, characterized in that: The resisting member (530) includes a pivot (531) fixed to the upper surface of the driver sleeve (100), and an arc-shaped card (532) is rotatable on the surface of the pivot (531), an arc-shaped opening (533) for engaging the upper rod body (522) is provided at the end of the arc-shaped card (532), and a plurality of positioning circular holes (534) are provided at the end of the arc-shaped opening (533), and the upper rod head (521) is sunk into the positioning circular hole (534) to position the resisting member (530).

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