CN212296295U - Large-drift-diameter single-double quick-change rotary blowout preventer assembly - Google Patents

Abstract

The utility model discloses a large-drift-diameter single-double quick-change rotary blowout preventer assembly, which comprises a driving assembly, an upper rubber core rotary assembly and a lower rubber core rotary assembly detachably connected with the bottom of the upper rubber core rotary assembly; the gluing core rotating assembly comprises an upper central shaft protective sleeve, a gluing core shell, a gluing core framework, a gluing core driving hanger and a gluing core sealing gland. This rotatory preventer assembly of single two quick changes in big latus rectum compromise big latus rectum center pin size and high dynamic seal pressure, guarantee under the unchangeable prerequisite in center pin latus rectum, can realize the quick switch of high pressure double glue core assembly and the single core assembly of gluing of low pressure, simultaneously, improved the connected mode of gluing core hanger and sealed gluey core, the connected mode of core sealing gland and last rubber core shell is glued on upper portion, the fixed mode of rotating the sealed bush can prevent effectively that vibrations from causing the screw thread not hard up, the sealed condition that the bush wearing and tearing and the equipment seal that leads to became invalid, the utility model discloses compact structure, simple, the on-the-spot dismouting of being convenient for.

Description

Large-drift-diameter single-double quick-change rotary blowout preventer assembly

Technical Field

The utility model relates to a preventer technical field, especially a rotatory preventer assembly of single two quick changes of big latus rectum.

Background

Rotary blowout preventers are one of the core devices for implementing underbalanced (liquid phase, gas phase) drilling, managed pressure drilling, and other drilling technologies. The rotary sealing and drilling device is mainly used for realizing rotary sealing and drilling of a drilling tool under the condition of certain wellhead pressure. Generally, a passive rotary blowout preventer mainly comprises a rotary assembly, a shell, a hoop and the like, wherein the rotary assembly is a main component of the rotary blowout preventer and is an important component for realizing rotary sealing of a drilling tool.

The rotary assembly of the rotary blowout preventer used at present generally comprises a high-pressure double-rubber-core assembly and a low-pressure single-rubber-core assembly, the drift diameter of a central shaft of the conventional high-pressure double-rubber-core assembly is limited due to the structure, the conventional high-pressure double-rubber-core assembly is limited by the capacity of a drilling tool, but the conventional high-pressure double-rubber-core assembly is provided with the rotary assembly with a large drift diameter central shaft and is mostly a low-pressure single-rubber core, the bearing capacity of the conventional high-pressure double-rubber-core assembly is low, the rotary blowout preventer assemblies of.

The existing high-pressure rotary blowout preventer assembly generally adopts a mode of installing an upper rubber core assembly and a lower rubber core assembly to improve the dynamic sealing pressure of the rotary blowout preventer assembly, the upper rubber core assembly is integrally a sealing cavity, and an upper rubber core sealing gland and an upper rubber core shell are generally connected in a mode of threads or bolts. Meanwhile, no matter the high-pressure double-rubber-core or low-pressure single-rubber-core rotating blowout preventer assembly, the rubber core is mounted in a manner that the rubber core hanger is connected with the rubber core through a bolt, and the end face of the rubber core is tightly attached to the hanger to realize sealing mainly by means of the pretightening force of the bolt between the rubber core and the hanger.

In the field operation process, due to the rotation of a drilling tool and the vibration of a wellhead, the upside-down buckling or loosening of the upper rubber core shell and the upper rubber core sealing gland of the high-pressure double-rubber-core rotating assembly easily occurs, and the loosening of bolts on the binding surface of a rubber core hanger and the rubber core occurs, so that the sealing failure of the rotating assembly is caused, and the accidental conditions such as abrasion and scrapping of the core shaft are caused.

In addition, the conventional rotary blowout preventer assembly usually adopts the threaded mode to be connected wear-resisting dynamic seal bush and the dabber of rotary assembly, realize dynamic seal again with between the dynamic seal subassembly, in order to prevent rotatory in-process dynamic seal bush dropout or pine take off, usually adopt the solder joint and use sealed mode of gluing to fix it, along with the accumulation of live time, wear-resisting dynamic seal bush sealing surface can wear gradually and lead to the dynamic seal to become invalid, when dismantling and changing the dynamic seal bush, need to use specialized tool or special treatment to realize, because the site conditions restriction, compulsory treatment probably damages dabber, seal subassembly, cause the bearing to damage or scrap, can only return the factory maintenance, influence the construction progress, the maintenance cycle is long, the cost of transportation is high. The Chinese patent with the publication number of CN209494545U provides an easily assembled and disassembled rotary blowout preventer rotary assembly, which changes the connection modes between an upper rubber core connecting seat and an upper rubber core mounting cylinder, between the upper rubber core mounting cylinder, between an upper movable sealing sleeve and a mandrel, and between the mandrel, a lower movable sealing sleeve and a lower rubber core mounting seat, and relieves the technical problems to a certain extent, but the sealing rubber core and a rubber core hanger are still connected and sealed in a threaded pre-tightening mode, a movable sealing bush and a middle mandrel are still fixed by using screws, and once the threads are loosened or the thread heads are worn, the problems that the upper rubber core sealing gland, the sealing rubber core hanger are failed in sealing, the equipment is difficult to assemble and disassemble and the like still occur.

SUMMERY OF THE UTILITY MODEL

For solving the problem that exists among the prior art, the utility model provides a rotatory preventer assembly of single two quick changes in big latus rectum, compromise big latus rectum center pin size and high dynamic seal pressure, under the unchangeable prerequisite of guaranteeing the center pin latus rectum, can realize the quick switching of high pressure double glue core assembly and low pressure single glue core assembly, and simultaneously, the connected mode of gluing core hanger and sealed gluey core has been improved, the connected mode of core seal gland and last rubber core shell is glued on upper portion, the fixed mode of rotating the sealed bush can prevent effectively that vibrations from causing the screw thread not hard up, the sealed condition that the bush wearing and tearing lead to of equipment seal became invalid, the utility model discloses compact structure, simple, the on-the-spot dismouting of being convenient for, the practicality is strong, easily promotes.

The utility model adopts the technical proposal that:

a large-drift-diameter single-double quick-change rotary blowout preventer assembly comprises a driving assembly, an upper rubber core rotary assembly and a lower rubber core rotary assembly which is detachably connected with the bottom of the upper rubber core rotary assembly; the gluing core rotating assembly comprises an upper central shaft protective sleeve, a gluing core shell, a gluing core framework, a gluing core driving hanger and a gluing core sealing gland; the upper rubber core protective sleeve is in a hollow annular column structure, an inward boss is arranged on the inner wall of the bottom of the upper rubber core outer shell, the lower rubber core rotating assembly is detachably connected with the boss, a cylindrical internal thread is arranged on the inner wall of the upper rubber core outer shell positioned on the upper portion of the boss, a cylindrical external thread matched with the cylindrical internal thread of the upper rubber core outer shell is arranged on the cylindrical surface of the outer wall of the upper central shaft protective sleeve, and the upper central shaft protective sleeve is in threaded connection with the inner wall of the upper rubber core outer shell on the upper portion of the boss; the gluing core is arranged in a gluing core shell, a gluing core framework is embedded in an inner cavity of the upper end face of the gluing core shell, the axial section of one side of the gluing core framework, which is an axis, is of an L-shaped circular structure, the part of the gluing core framework, which protrudes out of the top end face of the gluing core, is of a cylindrical structure, the inner wall of the gluing core driving hanger comprises two cylindrical surfaces, namely a cylindrical surface I and a cylindrical surface II, which are arranged from bottom to top, the inner diameter of the cylindrical surface I is larger than that of the cylindrical surface II, the outer wall of the cylindrical structure of the gluing core framework is matched with the cylindrical surface I, and the cylindrical structure of the gluing core framework is detachably connected with the lower end of the gluing core driving; the outer wall of the gluing core driving hanger comprises two cylindrical surfaces which are arranged from top to bottom and are respectively a cylindrical surface three and a cylindrical surface four, the outer diameter of the cylindrical surface three is smaller than the outer diameter of the cylindrical surface four, the inner wall of the gluing core sealing gland comprises two cylindrical surfaces which are arranged from top to bottom and are respectively a cylindrical surface five and a cylindrical surface six, the inner diameter of the cylindrical surface five is smaller than the inner diameter of the cylindrical surface six, a first bump is arranged on the cylindrical surface four, and a first groove matched with the first bump is arranged on the cylindrical surface six so as to limit the axial rotation and sliding of the gluing core driving hanger relative to the gluing core sealing gland; the outer wall of the middle part of the upper rubber core sealing gland is provided with a second bump, and the inner cavity of the upper end of the upper rubber core shell is provided with a second groove matched with the second bump; the outer wall of the driving assembly is provided with a third bump, and the upper end face of the upper rubber core driving hanger is provided with a third groove matched with the three phases of the bumps. The drive assembly can drive the gluing core to drive the hanger to rotate around the shaft.

Preferably, the outer wall of the cylindrical structure of rubberizing core skeleton is equipped with screw thread blind hole one, the cylinder one of rubberizing core drive hanger is equipped with the counter sink one that link up rubberizing core drive hanger lateral wall, the counter sink side position of counter sink one is in the outside of rubberizing core drive hanger, screw thread blind hole one is connected through gluey core connecting screw with counter sink one, in order to restrict the rubberizing dabber is to rotating and sliding, just be equipped with sealing washer one between the outer wall of the cylindrical structure of rubberizing core skeleton and the cylinder one of rubberizing core drive hanger, and sealing washer one is located the top of gluey core connecting screw.

Preferably, a second sealing ring is arranged between the outer wall of the upper rubber core sealing gland below the second bump and the inner wall of the upper rubber core shell, and a third sealing ring is arranged between the second cylindrical surface of the upper rubber core driving hanger and the fifth cylindrical surface of the upper rubber core sealing gland.

Preferably, a plurality of mutually independent first projections are arranged on the fourth cylindrical surface of the upper rubber core driving hanger, and a plurality of mutually independent first grooves which are respectively matched with the first projections are arranged on the sixth cylindrical surface of the upper rubber core sealing gland; the middle outer wall of the upper rubber core sealing gland is provided with a plurality of mutually independent lugs II, and the upper end inner cavity of the upper rubber core shell is provided with a plurality of mutually independent grooves II which are respectively matched with the lugs II.

Preferably, the lower rubber core rotating assembly comprises an oil injection joint, an assembly upper gland, an upper dynamic sealing bush, an upper sealing sleeve, a centering bearing, a thrust bearing, a central shaft, an assembly shell, a bearing seat, a lower sealing sleeve, an assembly lower gland, a lower dynamic sealing bush, a lower rubber core hanger, a lower rubber core framework, a lower dynamic sealing component, an upper dynamic sealing component and a balanced pressure joint;

the assembly shell is of a hollow annular column structure, a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface and a fifth step cylindrical surface are sequentially arranged in an inner cavity of the assembly shell from top to bottom, the inner diameters of the first step cylindrical surface to the third step cylindrical surface of the assembly shell are increased from small to large, the inner diameters of the third step cylindrical surface to the fifth step cylindrical surface of the assembly shell are decreased from large to small, a plurality of threaded blind holes II are uniformly distributed on the upper end surface of the assembly shell, a plurality of threaded blind holes III are uniformly distributed on the lower end surface of the assembly shell, a threaded sealing hole I is further arranged on the upper end surface of the assembly shell, a through hole I is arranged in the assembly shell, one end of the through hole I is communicated with the threaded sealing hole I, the other end of the through hole I is communicated with the inner cavity of the assembly shell, an oil injection joint is arranged in the sealed threaded hole I, a through hole II penetrating through the side wall of the assembly shell, the balance pressure joint is arranged in the second thread sealing hole;

the inner cavity of the central shaft is an equal-diameter through hole, the outer wall of the central shaft is sequentially provided with a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface, a fifth step cylindrical surface, a sixth step cylindrical surface and a seventh step cylindrical surface from top to bottom, the outer diameters of the first step cylindrical surface to the fourth step cylindrical surface of the central shaft are increased from small to large, the outer diameters of the fourth step cylindrical surface to the seventh step cylindrical surface of the central shaft are decreased from large to small, the uppermost end face of the central shaft is provided with a plurality of uniformly distributed threaded blind holes four, the boss is provided with a plurality of through holes three corresponding to the threaded blind holes four, the through holes three and the threaded blind holes four are;

the upper dynamic sealing bush is of a circular ring structure and is arranged on a first step of the central shaft, the upper end surface of the upper dynamic sealing bush is in close contact with the lower end surface of the upper rubber core shell, the inner wall of the upper end of the upper dynamic sealing bush is provided with a plurality of lugs four which are uniformly distributed inwards, and the central shaft is provided with a plurality of grooves four which are respectively matched with the lugs four, so that the upper dynamic sealing bush cannot rotate relative to the central shaft;

the upper sealing sleeve and the upper dynamic sealing assembly are jointly arranged between the outer wall of the upper dynamic sealing bush and the first step cylindrical surface of the assembly shell;

the assembly upper gland is of an annular structure and is connected with a threaded blind hole II on the upper end surface of the assembly shell through an upper connecting screw, and the lower end surface of the assembly upper gland is tightly contacted with the upper seal sleeve and the upper end surface of the upper movable seal component;

two groups of righting bearings are respectively arranged between the second step cylindrical surface of the assembly shell and the second step cylindrical surface of the central shaft and between the fifth step cylindrical surface of the assembly shell and the sixth step cylindrical surface of the central shaft, each group of righting bearings comprises two righting bearings which are symmetrically arranged by the axis of the central shaft, the top of an outer ring of the righting bearing which is positioned above is tightly contacted with the lower end surface of the upper sealing sleeve, the top of an inner ring is tightly contacted with the lower end surface of the upper dynamic sealing bush, a bearing seat is arranged between the outer wall of the righting bearing which is positioned below and the inner wall of the assembly shell, two groups of thrust bearings are respectively arranged between the fourth step cylindrical surface of the assembly shell and the third step cylindrical surface of the central shaft and between the fourth step cylindrical surface of the assembly shell and the fifth step cylindrical surface of the central shaft, each group of thrust bearings comprises two thrust bearings which, two end faces of the thrust bearing positioned above are respectively contacted with the upper end face of a fourth step cylindrical surface of the assembly shell and the lower end face of a third step cylindrical surface of the central shaft, two end faces of the thrust bearing positioned below are respectively contacted with the upper end face of a fifth step cylindrical surface of the central shaft and the lower end face of the fourth step cylindrical surface of the assembly shell, the bearing seat is arranged on the outer ring of the centering bearing, and the upper end face of the bearing seat is contacted with the upper end face of the thrust bearing positioned below;

the lower dynamic sealing bush is of a circular ring structure, is arranged on the seventh step cylindrical surface of the central shaft and is in contact with the lower end surface of the centering bearing positioned below, a plurality of inward-protruding lugs IV are uniformly distributed on the inner side of the lower end of the lower dynamic sealing bush, and a plurality of grooves IV which are respectively matched with the lugs IV are formed in the outer wall of the lower end of the central shaft, so that the lower dynamic sealing bush cannot rotate relative to the central shaft;

the assembly lower gland is of an annular structure with a convex axial section on one side of the axis, a plurality of through holes five corresponding to the threaded blind holes three on the lower end face of the assembly shell are formed in the step on the outer side of the assembly lower gland, the through holes five are connected with the threaded blind holes three through lower connecting screws, and the uppermost end face of the assembly lower gland is in contact with the lower end face of the bearing seat;

the lower sealing sleeve and the lower dynamic sealing component are jointly arranged between the outer wall of the lower dynamic sealing bush and the inner wall of the assembly lower gland, the outer wall of the lower sealing sleeve is provided with cylindrical surface external threads, the inner wall of the uppermost end of the assembly lower gland is provided with cylindrical surface internal threads matched with the cylindrical surface external threads of the lower sealing sleeve, the lower sealing sleeve is in threaded connection with the assembly lower gland, and the upper end surface of the lower sealing sleeve is in contact with the bearing block and the lower end surface of the lower centering bearing;

the lower rubber core hanger is of a 7-shaped ring structure, the axial cross section of one side of the axis of the lower rubber core hanger faces the inner side of the lower rubber core hanger, the lowest end face of the central shaft is provided with a plurality of uniformly distributed threaded blind holes five, a plurality of counter bores two corresponding to the threaded blind holes five are arranged at the step of the inner side of the upper end of the lower rubber core hanger respectively, the threaded blind holes five and the counter bores two are connected through a central shaft connecting bolt, the lower end of the outer wall of the lower rubber core hanger is uniformly provided with a plurality of counter bores three arranged along the lower rubber core hanger along the circumference, the counter bores three penetrate through the lower rubber core hanger, the outermost circle of the lower rubber core hanger is provided with steps, the inner side of the lower end of the lower gland is arranged in the steps of the lower rubber core hanger, and the inner cavity of the upper end of the lower rubber core is embedded with a lower rubber core framework, the lower rubber core framework is of an L-shaped circular ring structure, the part, protruding out of the upper end face of the lower rubber core, of the lower rubber core framework is of a cylindrical structure, the outer wall of the cylindrical structure of the lower rubber core framework is matched with the inner wall of the lowest end of the lower rubber core hanger, the outer wall of the cylindrical structure of the lower rubber core framework is provided with a plurality of threaded blind holes six corresponding to the three countersunk holes, and the threaded blind holes six are connected with the three countersunk holes through rubber core connecting bolts.

Preferably, a fourth sealing ring is arranged between the upper end surface of the upper dynamic sealing bush and the lower end surface of the upper rubber core shell, and a fifth sealing ring is arranged between the inner wall of the upper dynamic sealing bush and the outer wall of the central shaft; a fourth through hole matched with the second through hole of the assembly shell is formed in the outer wall of the upper sealing sleeve, and six sealing rings are arranged between the outer wall of the upper sealing sleeve and the inner wall of the assembly shell and above and below the fourth through hole respectively; the outer side of the lower end surface of the upper rubber core shell is provided with a step, the inner side of the upper end of the upper gland of the assembly is arranged in the step of the lower end surface of the upper rubber core shell, and an upper end sealing component is arranged between the upper end surface of the step of the lower end surface of the upper rubber core shell and the upper end surface of the upper gland of the assembly; a seventh sealing ring is arranged between the inner wall of the lower dynamic sealing bush and the seventh step cylindrical surface of the central shaft; a sealing ring eighth is arranged between the cylindrical surface above the step on the outer side of the lower gland of the assembly and the fifth cylindrical surface of the outer shell of the assembly; the upper end surface of the lower rubber core hanger is in mutual contact with the lower end surface of the lower dynamic seal bushing, and a sealing ring nine is arranged between the upper end surface of the lower rubber core hanger and the lower end surface of the lower dynamic seal bushing; a lower end sealing component is arranged between the upper end face of the outermost circle of the lower rubber core hanger and the lower end face of the lower gland of the assembly; and a ten sealing ring is arranged between the outer wall of the cylindrical structure of the lower rubber core framework and the inner wall of the lowermost end of the lower rubber core hanger, and the ten sealing ring is positioned above the six threaded blind holes.

Preferably, the single-rubber-core driving sleeve further comprises an upper-end sealing sleeve and a single-rubber-core driving sleeve, wherein a counter bore four corresponding to the threaded blind hole four is formed in the side wall of the single-rubber-core driving sleeve along the axis of the side wall of the single-rubber-core driving sleeve, the counter bore four penetrates through the upper end face and the lower end face of the single-rubber-core driving sleeve, a groove five adaptive to a three-phase of a bump is formed in the upper end face of the single-rubber-core driving sleeve, the driving assembly can drive the single-rubber-core driving sleeve to rotate around the axis, the single-rubber-core driving sleeve is connected with the threaded blind hole four through a central axis connecting bolt after the lower rubber-core rotating assembly and the upper rubber-core rotating assembly are disassembled at the bottom, the inner diameter of the single-rubber-core driving sleeve; the upper end sealing sleeve is arranged on the outer side of the single rubber core driving sleeve and is connected with the single rubber core driving sleeve through a plurality of uniformly distributed screws, and an upper end sealing assembly is arranged between the lower end face of the upper end sealing sleeve and the upper end face of the upper gland of the assembly.

The utility model has the advantages that:

1. the large-diameter central shaft size and the high dynamic sealing pressure are taken into consideration, the speed conversion of a high-pressure double-rubber-core assembly and a low-pressure single-rubber-core assembly can be realized on the premise of ensuring the same diameter of the central shaft, when the large-diameter central shaft is used on site, only a single-rubber-core driving sleeve and an upper end sealing sleeve of a single-rubber-core rotating blowout preventer assembly are required to be taken down, a rubber core shell is arranged on the central shaft, and then a rubber core hanger, a rubber core pressing cover and an upper rubber core are combined and then arranged in the rubber core shell to be converted into the high-pressure double-rubber-core assembly;

2. the connection mode of the rubber core hanger and the sealing rubber core is improved, the original end face sealing is improved into cylindrical surface sealing, even if the rubber core connecting screw is slightly loosened due to vibration in the use process, the rubber core is always in a sealing state and cannot leak due to the long cylindrical surface sealing contact surface, so that the rubber core hanger is safer and more reliable;

3. the connection mode of the sealing gland of the upper rubber core and the shell of the upper rubber core is improved, the existing connection mode of threads and bolts is improved into the connection mode of concave-convex clamping grooves, the threads cannot be reversely buckled or slip due to vibration in use, the sealing performance of the upper rubber core and the shell is ensured to be always safe, the installation and the disassembly are easier, and the labor intensity is lower.

4. The fixed mode of rotating the sealed bush has been improved, adopt the terminal surface to compress tightly the mode and restrict bush axial displacement, the mode restriction bush that adopts unsmooth draw-in groove rotates around the axle, simultaneously through set up the multiunit sealing member at the bush inner wall, under the prerequisite of guaranteeing sealed effect, make the bush can slightly swing in small clearance within range, the vibration impact when can effectively slow down the running friction alleviates bush wearing and tearing situation increase of service life, this simple structure, the dismouting is easy, the function is suitable for. The utility model discloses compact structure, safe and reliable, easy dismounting maintains easily, the facilitate promotion.

Drawings

Fig. 1 is a schematic structural view of the embodiment of the present invention in a single rubber core state;

FIG. 2 is a schematic structural view of the embodiment of the present invention in a double-rubber-core state;

FIG. 3 is a schematic view of the top view structure of the end face of the upper and lower dynamic seal bushings engaged with the central shaft according to the embodiment of the present invention;

FIG. 4 is a schematic axial sectional view of an assembly housing according to an embodiment of the present invention;

fig. 5 is a schematic axial sectional structure view of a center shaft according to an embodiment of the present invention;

reference numerals: 1. a driving assembly, 2, an oil injection joint, 3, an assembly upper gland, 4, an upper dynamic sealing bush, 5, an upper sealing sleeve, 6, a centering bearing, 7, a thrust bearing, 8, a central shaft, 9, an assembly shell, 10, a bearing seat, 11, a lower sealing sleeve, 12, a lower connecting screw, 13, an assembly lower gland, 14, a lower dynamic sealing bush, 15, a lower rubber core hanger, 16, a lower rubber core, 17, a lower rubber core framework, 18, a rubber core connecting screw, 19, a lower end sealing component, 20, a central shaft connecting bolt, 21, a lower dynamic sealing component, 22, an upper dynamic sealing component, 23, a balance pressure joint, 24, an upper end sealing component, 25, an upper connecting screw, 26, an upper end sealing sleeve, 27, a single rubber core driving sleeve, 28, an upper central shaft protecting sleeve, 29, an upper rubber core shell, 30, an upper rubber core, 31, an upper rubber core framework, 32, an upper rubber core driving hanger, 33. the gluing core seals the gland.

Detailed Description

Embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

Examples

As shown in fig. 2 and 3, the large-drift-diameter single-double quick-change rotary blowout preventer assembly comprises a driving assembly 1, an upper rubber core rotating assembly and a lower rubber core rotating assembly detachably connected with the bottom of the upper rubber core rotating assembly; the upper rubber core rotating assembly comprises an upper central shaft protective sleeve 28, an upper rubber core shell 29, an upper rubber core 30, an upper rubber core framework 31, an upper rubber core driving hanger 32 and an upper rubber core sealing gland 33; the upper rubber core casing 29 is of a hollow annular column structure, an inward boss is arranged on the inner wall of the bottom of the upper rubber core casing 29, the lower rubber core rotating assembly is detachably connected with the boss, a cylindrical internal thread is arranged on the inner wall of the upper rubber core casing 29 positioned on the upper portion of the boss, a cylindrical external thread matched with the cylindrical internal thread of the upper rubber core casing 29 is arranged on the cylindrical surface of the outer wall of the upper central shaft protecting sleeve 28, and the upper central shaft protecting sleeve 28 is in threaded connection with the inner wall of the upper rubber core casing 29 on the upper portion of the boss; the gluing core 30 is arranged in the gluing core shell 29, a gluing core framework 31 is embedded in an inner cavity of the upper end face of the gluing core shell, the axial section of the gluing core framework 31 on one side of an axis is of an L-shaped ring structure, the part of the gluing core framework 31 protruding above the top end face of the gluing core 30 is of a cylindrical structure, the inner wall of the gluing core driving hanger 32 comprises two cylindrical surfaces which are arranged from bottom to top and are respectively a cylindrical surface I and a cylindrical surface II, the inner diameter of the cylindrical surface I is larger than that of the cylindrical surface II, the outer wall of the cylindrical structure of the gluing core framework 31 is matched with the cylindrical surface I, and the cylindrical structure of the gluing core framework 31 is detachably connected with the lower end of the gluing core driving hanger 32; the outer wall of the upper rubber core driving hanger 32 comprises two cylindrical surfaces which are arranged from top to bottom and are respectively a cylindrical surface three and a cylindrical surface four, the outer diameter of the cylindrical surface three is smaller than that of the cylindrical surface four, the inner wall of the upper rubber core sealing gland 33 comprises two cylindrical surfaces which are arranged from top to bottom and are respectively a cylindrical surface five and a cylindrical surface six, the inner diameter of the cylindrical surface five is smaller than that of the cylindrical surface six, a first bump is arranged on the cylindrical surface four, and a first groove matched with the first bump is arranged on the cylindrical surface six to limit the axial rotation and sliding of the upper rubber core driving hanger 32 relative to the upper rubber core sealing gland 33; a second bump is arranged on the outer wall of the middle part of the upper rubber core sealing gland 33, and a second groove matched with the second bump is arranged in the inner cavity of the upper end of the upper rubber core shell 29; the outer wall of the driving assembly 1 is provided with a third bump, and the upper end face of the upper rubber core driving hanger 32 is provided with a third groove matched with the three phases of the bump. The drive assembly 1 can drive the upper rubber core drive hanger 32 to rotate around the shaft.

In one embodiment, the outer wall of the cylindrical structure of the upper rubber core framework 31 is provided with a first threaded blind hole, a first cylindrical surface of the upper rubber core driving hanger 32 is provided with a first counter bore penetrating through the side wall of the upper rubber core driving hanger 32, the first counter bore of the first counter bore is positioned on the outer side of the upper rubber core driving hanger 32, the first threaded blind hole is connected with the first counter bore through a rubber core connecting screw 18 to limit the axial rotation and sliding of the upper rubber core 30, a first sealing ring is arranged between the outer wall of the cylindrical structure of the upper rubber core framework 31 and the first cylindrical surface of the upper rubber core driving hanger 32, and the first sealing ring is positioned above the rubber core connecting screw 18.

In one embodiment, a second sealing ring is arranged between the outer wall of the upper core sealing gland 33 below the second bump and the inner wall of the upper core shell 29, and a third sealing ring is arranged between the second cylindrical surface of the upper core driving hanger 32 and the fifth cylindrical surface of the upper core sealing gland 33.

In one embodiment, a plurality of mutually independent first protrusions are arranged on the fourth cylindrical surface of the gluing core driving hanger 32, and a plurality of mutually independent first grooves which are respectively matched with the first protrusions are arranged on the sixth cylindrical surface of the gluing core sealing gland 33; the middle outer wall of the upper rubber core sealing gland 33 is provided with a plurality of mutually independent second projections, and the upper end inner cavity of the upper rubber core shell 29 is provided with a plurality of mutually independent second grooves which are respectively matched with the second projections.

In one embodiment, the lower rubber core rotating assembly comprises an oil injection joint 2, an assembly upper gland 3, an upper dynamic seal bushing 4, an upper seal sleeve 5, a centering bearing 6, a thrust bearing 7, a central shaft 8, an assembly shell 9, a bearing seat 10, a lower seal sleeve 11, an assembly lower gland 13, a lower dynamic seal bushing 14, a lower rubber core hanger 15, a lower rubber core 16, a lower rubber core framework 17, a lower dynamic seal component 21, an upper dynamic seal component 22 and a balance pressure joint 23;

the assembly shell 9 is a hollow annular column structure, the inner cavity of the assembly shell 9 is sequentially provided with a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface and a fifth step cylindrical surface from top to bottom, the inner diameters of the first step cylindrical surface to the third step cylindrical surface of the assembly shell 9 are increased from small to large, the inner diameters of the third step cylindrical surface to the fifth step cylindrical surface of the assembly shell 9 are decreased from large to small, the upper end surface of the assembly shell 9 is uniformly distributed with a plurality of threaded blind holes II, the lower end surface of the assembly shell 9 is uniformly distributed with a plurality of threaded blind holes III, the upper end surface of the assembly shell 9 is also provided with a threaded sealing hole I, the assembly shell 9 is internally provided with a through hole I, one end of the through hole I is communicated with the threaded sealing hole I, the other end of the through hole I is communicated with the inner cavity of the assembly shell 9, the oil injection joint 2 is arranged in the threaded sealing hole I, a second threaded sealing hole is formed in one side, close to the outer wall of the assembly shell 9, of the through hole II, and the balance pressure joint 23 is arranged in the second threaded sealing hole;

the inner cavity of the central shaft 8 is an equal-diameter through hole, the outer wall of the central shaft 8 is sequentially provided with a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface, a fifth step cylindrical surface, a sixth step cylindrical surface and a seventh step cylindrical surface from top to bottom, the outer diameters of the first step cylindrical surface to the fourth step cylindrical surface of the central shaft 8 are increased from small to large, the outer diameters of the fourth step cylindrical surface to the seventh step cylindrical surface of the central shaft 8 are decreased from large to small, the uppermost end face of the central shaft 8 is provided with a plurality of uniformly distributed threaded blind holes four, the boss is provided with a plurality of through holes three corresponding to the threaded blind holes four, the through holes three and the threaded blind holes four are connected through the;

the upper dynamic seal bushing 4 is of a circular ring structure and is arranged on a first step of the central shaft 8, the upper end surface of the upper dynamic seal bushing 4 is in close contact with the lower end surface of the upper rubber core shell 29, the inner wall of the upper end of the upper dynamic seal bushing 4 is provided with a plurality of lugs four which are uniformly distributed inwards, the central shaft 8 is provided with a plurality of grooves four which are respectively matched with the lugs four, and the upper dynamic seal bushing 4 is enabled to be incapable of rotating relative to the central shaft 8;

the upper sealing sleeve 5 and the upper dynamic sealing component 22 are jointly arranged between the outer wall of the upper dynamic sealing bush 4 and the first step cylindrical surface of the assembly shell 9;

the assembly upper gland 3 is of an annular structure and is connected with a threaded blind hole II on the upper end surface of the assembly shell 9 through an upper connecting screw 25, and the lower end surface of the assembly upper gland 3 is tightly contacted with the upper sealing sleeve 5 and the upper end surface of the upper movable sealing component 22;

two groups of righting bearings 6 are respectively arranged between the second step cylindrical surface of the assembly shell 9 and the second step cylindrical surface of the central shaft 8 and between the fifth step cylindrical surface of the assembly shell 9 and the sixth step cylindrical surface of the central shaft 8, each group of righting bearings 6 comprises two righting bearings 6 which are symmetrically arranged by the axis of the central shaft 8, the top of the outer ring of the righting bearing 6 positioned above is tightly contacted with the lower end surface of the upper sealing sleeve 5, the top of the inner ring is tightly contacted with the lower end surface of the upper dynamic sealing bush 4, a bearing seat 10 is arranged between the outer wall of the righting bearing 6 positioned below and the inner wall of the assembly shell 9, two groups of thrust bearings 7 are respectively arranged between the fourth step cylindrical surface of the assembly shell 9 and the third step cylindrical surface of the central shaft 8 and between the fourth step cylindrical surface of the assembly shell 9 and the fifth step cylindrical surface of the central shaft 8, each group of thrust bearings 7 comprises two thrust bearings 7 which are symmetrically arranged by the, two end faces of the thrust bearing 7 positioned above are respectively contacted with the upper end face of a fourth step cylindrical surface of the assembly shell 9 and the lower end face of a third step cylindrical surface of the central shaft 8, two end faces of the thrust bearing 7 positioned below are respectively contacted with the upper end face of a fifth step cylindrical surface of the central shaft 8 and the lower end face of the fourth step cylindrical surface of the assembly shell 9, the bearing seat 10 is arranged on an outer ring of the centering bearing 6, and the upper end face of the bearing seat 10 is contacted with the upper end face of the thrust bearing 7 positioned below so as to be limited by the bearing seat 10;

the lower dynamic seal bush 14 is of a circular ring structure, is arranged on the seventh step cylindrical surface of the central shaft 8, is in contact with and limited by the lower end surface of the lower centering bearing 6, a plurality of inward-protruding lugs IV are uniformly distributed on the inner side of the lower end of the lower dynamic seal bush 14, and a plurality of grooves IV which are respectively matched with the lugs IV are formed in the outer wall of the lower end of the central shaft 8, so that the lower dynamic seal bush 14 cannot rotate relative to the central shaft 8;

the axial section of one side of the axis of the assembly lower gland 13 is of a convex annular structure, a plurality of through holes five which respectively correspond to the threaded blind holes three on the lower end surface of the assembly shell 9 are arranged on the step on the outer side of the assembly lower gland 13, the through holes five are connected with the threaded blind holes three through lower connecting screws 12, and the uppermost end surface of the assembly lower gland 13 is in contact with and limited by the lower end surface of the bearing seat 10;

the lower sealing sleeve 11 and the lower dynamic sealing component 21 are jointly arranged between the outer wall of the lower dynamic sealing bush 14 and the inner wall of the assembly lower gland 13, the outer wall of the lower sealing sleeve 11 is provided with cylindrical external threads, the uppermost inner wall of the assembly lower gland 13 is provided with cylindrical internal threads matched with the cylindrical external threads of the lower sealing sleeve 11, the lower sealing sleeve 11 is in threaded connection with the assembly lower gland 13, and the upper end face of the lower sealing sleeve 11 is in contact with and limited by the bearing seat 10 and the lower end face of the lower centering bearing 6;

the lower rubber core hanger 15 is of a 7-shaped ring structure, the axial cross section of one side of the axis is a convex step part facing the inner side of the lower rubber core hanger 15, the lowest end surface of the central shaft 8 is provided with a plurality of uniformly distributed threaded blind holes V, the step part on the inner side of the upper end of the lower rubber core hanger 15 is provided with a plurality of counter bores II respectively corresponding to the threaded blind holes V, the threaded blind holes V and the counter bores II are connected through a central shaft 8 connecting bolt, the lower end of the outer wall of the lower rubber core hanger 15 is uniformly provided with a plurality of counter bores III arranged along the lower rubber core hanger 15 along the circumference, the counter bores III penetrate through the lower rubber core hanger 15, the outermost upper end of the lower rubber core hanger 15 is provided with a step, the inner side of the lower end of the assembly lower gland 13 is arranged in the step of the lower rubber core hanger 15, the inner cavity of the upper end surface of the lower rubber core 16 is embedded with a rubber core framework 17, the lower rubber core framework 17 is of an L-shaped circular ring structure as the axial cross section on one side of the axis, the part, protruding out of the upper end face of the lower rubber core 16, of the lower rubber core framework 17 is of a cylindrical structure, the outer wall of the cylindrical structure of the lower rubber core framework 17 is matched with the inner wall of the lowest end of the lower rubber core hanger 15, the outer wall of the cylindrical structure of the lower rubber core framework 17 is provided with a plurality of threaded blind holes six corresponding to the three countersunk holes, and the threaded blind holes six are connected with the three countersunk holes through rubber core connecting bolts and are limited.

In one embodiment, a fourth sealing ring is arranged between the upper end surface of the upper dynamic sealing bush 4 and the lower end surface of the upper rubber core shell 29, and a fifth sealing ring is arranged between the inner wall of the upper dynamic sealing bush 4 and the outer wall of the central shaft 8; a fourth through hole matched with the second through hole of the assembly shell 9 is formed in the outer wall of the upper sealing sleeve 5, and six sealing rings are arranged between the outer wall of the upper sealing sleeve 5 and the inner wall of the assembly shell 9 and above and below the fourth through hole respectively; a step is arranged on the outer side of the lower end surface of the upper rubber core shell 29, the inner side of the upper end of the upper gland 3 of the assembly is arranged in the step of the lower end surface of the upper rubber core shell 29, and an upper end sealing component 24 is arranged between the upper end surface of the step of the lower end surface of the upper rubber core shell 29 and the upper end surface of the upper gland 3 of the assembly; a seventh sealing ring is arranged between the inner wall of the lower dynamic sealing bush 14 and the seventh step cylindrical surface of the central shaft 8; a sealing ring eighth is arranged between the cylindrical surface above the step at the outer side of the assembly lower gland 13 and the fifth cylindrical surface of the assembly shell 9; the upper end surface of the lower rubber core hanger 15 is contacted with the lower end surface of the lower dynamic seal bushing 14, and a sealing ring nine is arranged between the upper end surface and the lower end surface; a lower end sealing assembly 19 is arranged between the upper end face of the outermost circle of the lower rubber core hanger 15 and the lower end face of the assembly lower gland 13; and a ten sealing ring is arranged between the outer wall of the cylindrical structure of the lower rubber core framework 17 and the inner wall of the lowest end of the lower rubber core hanger 15, and the ten sealing ring is positioned above the six threaded blind holes.

In one embodiment, as shown in fig. 1, the single-rubber-core driving sleeve 27 further includes an upper-end sealing sleeve 26 and a single-rubber-core driving sleeve 27, a counter bore four corresponding to the threaded blind hole four is formed in a side wall of the single-rubber-core driving sleeve 27 along an axis of the single-rubber-core driving sleeve 27, the counter bore four penetrates through upper and lower end faces of the single-rubber-core driving sleeve 27, a groove five adapted to a three-phase of a bump is formed in the upper end face of the single-rubber-core driving sleeve 27, the driving assembly 1 can drive the single-rubber-core driving sleeve 27 to rotate around an axis, when the single-rubber-core driving sleeve is used as a single-rubber-core state, after the lower-rubber-core rotating assembly and the upper-rubber-core rotating assembly are disassembled at the bottom, the single-rubber-core driving sleeve 27 is connected with the threaded blind hole four through a central shaft 8 connecting bolt, an inner diameter of the single; the upper end sealing sleeve 26 is arranged on the outer side of the single rubber core driving sleeve 27 and is connected with the single rubber core driving sleeve 27 through a plurality of uniformly distributed screws, an upper end sealing component 24 is arranged between the lower end face of the upper end sealing sleeve 26 and the upper end face of the assembly upper gland 3, and the lower rubber core rotating assembly can form a single rubber core state with the upper end sealing sleeve 26 and the single rubber core driving sleeve 27 and is directly matched with the driving assembly 1 for use.

The upper rubber core 30 and the lower rubber core 16 can be made of the same material, and both the structure and the size can be the same.

The upper rubber core framework 31 and the lower rubber core framework 17 can be made of the same material, and the structure and the size can be the same.

The upper end sealing assembly 24 and the lower end sealing assembly 19 are manufactured in a mode that a polytetrafluoroethylene rectangular ring and a wave spring are combined.

Application the rotatory preventer assembly of single two quick changes in big latus rectum compromises big latus rectum center pin size and high dynamic seal pressure, under the prerequisite of ensureing that the center pin latus rectum is the same, can realize the quick conversion of high pressure two rubber core assemblies and low pressure single rubber core assembly, when the field usage, only need to glue the single rubber core driving sleeve of the rotatory preventer assembly of single rubber core, the upper end seal cover takes off, install rubberizing core shell on the center pin, then with rubberizing core hanger, install after rubberizing core gland and upper portion are glued the core and are made up and can convert into high pressure two rubber core assemblies in gluing the core shell, this design can make equipment a tractor serves several purposes, effectively reduce the use, the maintenance cost.

Application rotatory preventer assembly of single two quick changes in big latus rectum has improved the connected mode who glues core hanger and sealed gluey core, improves original end face seal and seals for the cylinder, even slight not hard up appears in the gluey core connecting screw that takes place to shake in the use, because cylinder sealing contact surface is longer, glues the core and is in encapsulated situation all the time and can not the seepage, safe and reliable more.

Application the rotatory preventer assembly of two quick changes of big latus rectum list has improved the connected mode of rubberizing core sealing gland and rubberizing core shell, improves current screw thread and bolted connection mode into unsmooth draw-in groove connected mode, can not appear vibrations in the use and lead to screw thread back-off or smooth silk, ensures that the sealing performance of upper portion gluey core and shell is in safety all the time, and the installation is dismantled more easily simultaneously, and intensity of labour is lower.

Application the rotatory preventer assembly of single two quick changes in big latus rectum has improved the fixed mode of rotating seal bush, adopts the terminal surface to compress tightly the mode and restricts bush axial displacement, adopts the mode restriction bush pivoting of unsmooth draw-in groove, simultaneously through setting up the multiunit sealing member at the bush inner wall, under the prerequisite of ensureing sealed effect, make the bush can slightly swing in small clearance within range, the vibration impact when can effectively slow down the running friction, alleviate bush wearing and tearing situation increase of life, the steam generator is simple in structure, the dismouting is easy, the function is suitable for. The utility model discloses compact structure, safe and reliable, easy dismounting maintains easily, the facilitate promotion.

The above-mentioned embodiments only express the specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention.

Claims (7)

1. A large-drift-diameter single-double quick-change rotary blowout preventer assembly is characterized by comprising a driving assembly (1), an upper rubber core rotary assembly and a lower rubber core rotary assembly which is detachably connected with the bottom of the upper rubber core rotary assembly; the upper rubber core rotating assembly comprises an upper central shaft protective sleeve (28), an upper rubber core shell (29), an upper rubber core (30), an upper rubber core framework (31), an upper rubber core driving hanger (32) and an upper rubber core sealing gland (33); the upper glue core shell (29) is of a hollow annular column structure, an inward boss is arranged on the inner wall of the bottom of the upper glue core shell (29), the lower glue core rotating assembly is detachably connected with the boss, a cylindrical internal thread is arranged on the inner wall of the upper glue core shell (29) on the upper portion of the boss, a cylindrical external thread matched with the cylindrical internal thread of the upper glue core shell (29) is arranged on the cylindrical surface of the outer wall of the upper central shaft protective sleeve (28), and the upper central shaft protective sleeve (28) is in threaded connection with the inner wall of the upper glue core shell (29) on the upper portion of the boss; the gluing core (30) is arranged in the gluing core shell (29), a gluing core framework (31) is embedded in an inner cavity of the upper end face of the gluing core shell, the axial section of the gluing core framework (31) on one side of an axis is of an L-shaped circular ring structure, the part of the gluing core framework (31) protruding above the top end face of the gluing core (30) is of a cylindrical structure, the inner wall of the gluing core driving hanger (32) comprises two cylindrical surfaces which are arranged from bottom to top and are a cylindrical surface I and a cylindrical surface II respectively, the inner diameter of the cylindrical surface I is larger than that of the cylindrical surface II, the outer wall of the cylindrical structure of the gluing core framework (31) is matched with the cylindrical surface I, and the cylindrical structure of the gluing core framework (31) is detachably connected with the lower end of the gluing core driving hanger (32); the outer wall of the gluing core driving hanger (32) comprises two cylindrical surfaces which are arranged from top to bottom and are a cylindrical surface three and a cylindrical surface four respectively, the outer diameter of the cylindrical surface three is smaller than that of the cylindrical surface four, the inner wall of the gluing core sealing gland (33) comprises two cylindrical surfaces which are arranged from top to bottom and are a cylindrical surface five and a cylindrical surface six respectively, the inner diameter of the cylindrical surface five is smaller than that of the cylindrical surface six, the cylindrical surface four is provided with a first bump, and the cylindrical surface six is provided with a first groove matched with the first bump; a second bump is arranged on the outer wall of the middle part of the upper rubber core sealing gland (33), and a second groove matched with the second bump is arranged in the inner cavity of the upper end of the upper rubber core shell (29); the outer wall of the driving assembly (1) is provided with a third bump, and the upper end face of the gluing core driving hanger (32) is provided with a third groove matched with the three phases of the bump.

2. The large-drift-diameter single-double quick-change rotary blowout preventer assembly according to claim 1, wherein the outer wall of the cylindrical structure of the upper rubber core framework (31) is provided with a first threaded blind hole, the cylindrical surface of the upper rubber core driving hanger (32) is provided with a first countersunk hole penetrating through the side wall of the upper rubber core driving hanger (32), the countersunk side of the first countersunk hole is positioned on the outer side of the upper rubber core driving hanger (32), the first threaded blind hole and the first countersunk hole are connected through a rubber core connecting screw (18), a first sealing ring is arranged between the outer wall of the cylindrical structure of the upper rubber core framework (31) and the cylindrical surface of the upper rubber core driving hanger (32), and the first sealing ring is positioned above the rubber core connecting screw (18).

3. The large-drift-diameter single-double quick-change rotary blowout preventer assembly according to claim 1, wherein a second sealing ring is arranged between an outer wall of the upper rubber core sealing gland (33) below the second projection and an inner wall of the upper rubber core housing (29), and a third sealing ring is arranged between a second cylindrical surface of the upper rubber core driving hanger (32) and a fifth cylindrical surface of the upper rubber core sealing gland (33).

4. The large-drift-diameter single-double quick-change rotary blowout preventer assembly according to claim 1, wherein a first plurality of mutually independent projections are arranged on a fourth cylindrical surface of the upper rubber core driving hanger (32), and a first plurality of mutually independent grooves which are respectively matched with the first projections are arranged on a sixth cylindrical surface of the upper rubber core sealing gland (33); the middle outer wall of the upper rubber core sealing gland (33) is provided with a plurality of mutually independent second lugs, and the upper end inner cavity of the upper rubber core shell (29) is provided with a plurality of mutually independent second grooves which are respectively matched with the second lugs.

5. The large-drift-diameter single-double quick-change rotary blowout preventer assembly according to claim 1, wherein the lower rubber core rotary assembly comprises an oil injection joint (2), an assembly upper gland (3), an upper dynamic seal bushing (4), an upper seal sleeve (5), a centering bearing (6), a thrust bearing (7), a central shaft (8), an assembly housing (9), a bearing seat (10), a lower seal sleeve (11), an assembly lower gland (13), a lower dynamic seal bushing (14), a lower rubber core hanger (15), a lower rubber core (16), a lower rubber core framework (17), a lower dynamic seal component (21), an upper dynamic seal component (22) and a balance pressure joint (23);

the assembly shell (9) is of a hollow annular column structure, the inner cavity of the assembly shell (9) is sequentially provided with a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface and a fifth step cylindrical surface from top to bottom, the inner diameters of the first step cylindrical surface to the third step cylindrical surface of the assembly shell (9) are increased from small to large, the inner diameters of the third step cylindrical surface to the fifth step cylindrical surface of the assembly shell (9) are decreased from large to small, a plurality of threaded blind holes are uniformly distributed on the upper end surface of the assembly shell (9), a plurality of threaded blind holes are uniformly distributed on the lower end surface of the assembly shell (9), a threaded sealing hole I is further arranged on the upper end surface of the assembly shell (9), a through hole I is arranged in the assembly shell (9), one end of the through hole I is communicated with the threaded sealing hole I, the other end of the through hole I is communicated with the inner cavity of the assembly shell (9), an oil injection joint (2) is arranged in the sealed threaded hole I, and a through hole I penetrating through wall of the A second threaded sealing hole is formed in one side, close to the outer wall of the assembly shell (9), of the second through hole, and the balance pressure joint (23) is arranged in the second threaded sealing hole;

the inner cavity of the central shaft (8) is an equal-diameter through hole, the outer wall of the central shaft (8) is sequentially provided with a first step cylindrical surface, a second step cylindrical surface, a third step cylindrical surface, a fourth step cylindrical surface, a fifth step cylindrical surface, a sixth step cylindrical surface and a seventh step cylindrical surface from top to bottom, the outer diameters of the first step cylindrical surface to the fourth step cylindrical surface of the central shaft (8) are increased from small to large, the outer diameters of the fourth step cylindrical surface to the seventh step cylindrical surface of the central shaft (8) are decreased from large to small, the uppermost end face of the central shaft (8) is provided with a plurality of uniformly distributed threaded blind holes four, a boss is provided with a plurality of through holes three corresponding to the threaded blind holes four, the through holes three are connected with the threaded blind hole four through the central shaft (8) through;

the upper dynamic sealing bush (4) is of a circular ring structure and is arranged on a first step of the central shaft (8), the upper end surface of the upper dynamic sealing bush (4) is tightly contacted with the lower end surface of the upper rubber core shell (29), the inner wall of the upper end of the upper dynamic sealing bush (4) is provided with a plurality of inward uniformly distributed convex blocks IV, and the central shaft (8) is provided with a plurality of grooves IV which are respectively matched with the convex blocks IV;

the upper sealing sleeve (5) and the upper dynamic sealing component (22) are arranged between the outer wall of the upper dynamic sealing bush (4) and the first step cylindrical surface of the assembly shell (9) together;

the assembly upper gland (3) is of an annular structure and is connected with a threaded blind hole II on the upper end surface of the assembly shell (9) through an upper connecting screw (25), and the lower end surface of the assembly upper gland (3) is tightly contacted with the upper end surfaces of the upper sealing sleeve (5) and the upper movable sealing component (22);

two groups of righting bearings (6) are respectively arranged between the second step cylindrical surface of the assembly shell (9) and the second step cylindrical surface of the central shaft (8) and between the fifth step cylindrical surface of the assembly shell (9) and the sixth step cylindrical surface of the central shaft (8), each group of righting bearings (6) comprises two righting bearings (6) which are symmetrically arranged by the axis of the central shaft (8), the top of the outer ring of the righting bearing (6) positioned above is tightly contacted with the lower end surface of the upper sealing sleeve (5), the top of the inner ring is tightly contacted with the lower end surface of the upper dynamic sealing bush (4), a bearing seat (10) is arranged between the outer wall of the righting bearing (6) positioned below and the inner wall of the assembly shell (9), two groups of thrust bearings (7) are respectively arranged between the fourth step cylindrical surface of the assembly shell (9) and the third step cylindrical surface of the central shaft (8) and between the fourth step cylindrical surface of the assembly shell (9) and the fifth step cylindrical surface of the central shaft (8), each group of thrust bearings (7) comprises two thrust bearings (7) which are symmetrically arranged by the axis of the central shaft (8), two end faces of the thrust bearing (7) positioned above are respectively contacted with the upper end face of a fourth step cylindrical surface of the assembly shell (9) and the lower end face of a third step cylindrical surface of the central shaft (8), two end faces of the thrust bearing (7) positioned below are respectively contacted with the upper end face of a fifth step cylindrical surface of the central shaft (8) and the lower end face of the fourth step cylindrical surface of the assembly shell (9), the bearing seat (10) is arranged on the outer ring of the centering bearing (6), and the upper end face of the bearing seat (10) is contacted with the upper end face of the thrust bearing (7) positioned below;

the lower dynamic sealing bush (14) is of a circular ring structure, is arranged on a seventh step cylindrical surface of the central shaft (8) and is in contact with the lower end surface of the lower centering bearing (6), a plurality of inward-protruding lugs IV are uniformly distributed on the inner side of the lower end of the lower dynamic sealing bush (14), and a plurality of grooves IV which are respectively matched with the lugs IV are formed in the outer wall of the lower end of the central shaft (8);

the axial section of one side of the axis of the assembly lower gland (13) is of a convex annular structure, a plurality of through holes five which respectively correspond to the threaded blind holes three on the lower end surface of the assembly shell (9) are formed in the step on the outer side of the assembly lower gland (13), the through holes five are connected with the threaded blind holes three through lower connecting screws (12), and the uppermost end surface of the assembly lower gland (13) is in contact with the lower end surface of the bearing seat (10);

the lower sealing sleeve (11) and the lower dynamic sealing component (21) are jointly arranged between the outer wall of the lower dynamic sealing bush (14) and the inner wall of the assembly lower gland (13), the outer wall of the lower sealing sleeve (11) is provided with cylindrical external threads, the inner wall of the uppermost end of the assembly lower gland (13) is provided with cylindrical internal threads matched with the cylindrical external threads of the lower sealing sleeve (11), the lower sealing sleeve (11) is in threaded connection with the assembly lower gland (13), and the upper end surface of the lower sealing sleeve (11) is in contact with the lower end surfaces of the bearing block (10) and the lower centering bearing (6) positioned below;

the lower rubber core hanger (15) is of a 7-shaped ring structure, the axial section of one side of the axis is convex, the step part of the side surface of the lower rubber core hanger (15) faces the inner side of the lower rubber core hanger (15), the lowest end surface of the central shaft (8) is provided with a plurality of uniformly distributed threaded blind holes five, the step part of the inner side of the upper end of the lower rubber core hanger (15) is provided with a plurality of counter bores two corresponding to the threaded blind holes five respectively, the threaded blind holes five and the counter bores two are connected through a connecting bolt of the central shaft (8), the lower end of the outer wall of the lower rubber core hanger (15) is uniformly provided with a plurality of counter bores three arranged along the lower rubber core hanger (15) along the circumference, the counter bores three penetrate through the lower rubber core hanger (15), the outermost end of the lower rubber core hanger (15) is provided with a step, the inner side of the lower end of the lower gland (13) is arranged in the step of the lower rubber core hanger (15), lower rubber core skeleton (17) is inlayed to the up end inner chamber of lower rubber core (16), lower rubber core skeleton (17) is the ring structure of "L" font for the axial cross-section of axle center one side, lower rubber core skeleton (17) salient is the cylinder structure more than the top end face of lower rubber core (16), the outer wall of the cylinder structure of lower rubber core skeleton (17) and the lower extreme inner wall looks adaptation of lower rubber core hanger (15), the outer wall of the cylinder structure of lower rubber core skeleton (17) is equipped with a plurality of screw thread blind holes six that correspond with counterbore hole three, screw thread blind hole six and counterbore hole three cross rubber core connecting bolt and be connected.

6. The large-drift-diameter single-double quick-change rotary blowout preventer assembly according to claim 5, wherein a fourth seal ring is arranged between the upper end surface of the upper dynamic seal bushing (4) and the lower end surface of the upper rubber core housing (29), and a fifth seal ring is arranged between the inner wall of the upper dynamic seal bushing (4) and the outer wall of the central shaft (8); a fourth through hole matched with the second through hole of the assembly shell (9) is formed in the outer wall of the upper sealing sleeve (5), and six sealing rings are arranged between the outer wall of the upper sealing sleeve (5) and the inner wall of the assembly shell (9) and above and below the fourth through hole respectively; the outer side of the lower end face of the upper rubber core shell (29) is provided with a step, the inner side of the upper end of the upper gland (3) of the assembly is arranged in the step of the lower end face of the upper rubber core shell (29), and an upper end sealing component (24) is arranged between the upper end face of the step of the lower end face of the upper rubber core shell (29) and the upper end face of the upper gland (3) of the assembly; a seventh sealing ring is arranged between the inner wall of the lower dynamic sealing bush (14) and the seventh step cylindrical surface of the central shaft (8); a sealing ring eighth is arranged between the cylindrical surface above the step on the outer side of the assembly lower gland (13) and the fifth cylindrical surface of the assembly shell (9); the upper end surface of the lower rubber core hanger (15) is contacted with the lower end surface of the lower dynamic seal bushing (14) and a sealing ring nine is arranged between the upper end surface of the lower rubber core hanger and the lower end surface of the lower dynamic seal bushing; a lower end sealing component (19) is arranged between the upper end face of the outermost circle of the lower rubber core hanger (15) and the lower end face of the assembly lower gland (13); and a sealing ring ten is arranged between the outer wall of the cylindrical structure of the lower rubber core framework (17) and the inner wall of the lowermost end of the lower rubber core hanger (15), and the sealing ring ten is positioned above the threaded blind hole six.

7. The large-bore single-double quick-change rotary blowout preventer assembly according to claim 5, further comprising an upper end sealing sleeve (26) and a single rubber core driving sleeve (27), the side wall of the single rubber core driving sleeve (27) is provided with a counter bore four corresponding to the threaded blind bore four along the axis, the four counter bores penetrate through the upper end face and the lower end face of the single rubber core driving sleeve (27), the upper end face of the single rubber core driving sleeve (27) is provided with a groove five which is matched with the three phases of the convex block, after the lower rubber core rotating assembly and the upper rubber core rotating assembly are disassembled, the single rubber core driving sleeve (27) is connected with the threaded blind hole IV through a central shaft (8) connecting bolt, the inner diameter of the single rubber core driving sleeve (27) is matched with the inner diameter of the inner cavity of the central shaft (8), the outer diameter of the single rubber core driving sleeve (27) is larger than that of the first step cylindrical surface of the central shaft (8); the upper end sealing sleeve (26) is arranged on the outer side of the single rubber core driving sleeve (27) and is connected with the single rubber core driving sleeve (27) through a plurality of uniformly distributed screws, and an upper end sealing assembly (24) is arranged between the lower end face of the upper end sealing sleeve (26) and the upper end face of the assembly upper gland (3).

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