Double-conical-surface sealing electric drive annular blowout preventer

Abstract

The invention discloses a double-conical-surface sealing electrically-driven annular blowout preventer, which belongs to the technical field of petroleum drilling and production, comprises an outer shell, a supporting cylinder, a driving motor and a coupling, and is characterized by further comprising a rotary sliding shaft, a sleeve is sleeved outside the rotary sliding shaft, a conical piston and a connecting plate are arranged in the outer shell, and the connecting plate is connected with the supporting cylinder. The sleeve is embedded in the connecting plate, a round nut is arranged on the lower portion of the sleeve, a limiting nut is arranged on the upper portion of the sleeve, a double-cone-shaped rubber core is arranged on the supporting cylinder, a double-cone-shaped framework is embedded in the double-cone-shaped rubber core, a cone-shaped top cover is connected to the outer shell, and a mud blocking ring is connected to the bottom of the cone-shaped top cover. The blowout preventer is stable in structure and good in sealing performance, sealing is easier to achieve due to inward deformation after axial extrusion, conventional hydraulic control driving is replaced by electric driving, the blowout preventer is not affected by the environment temperature, installation is convenient, and the using safety of the blowout preventer is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of oil drilling and production, and particularly to a double-cone surface sealed electric-driven annular blowout preventer. Background Art

[0002] An annular blowout preventer is a safety sealing wellhead device commonly used in oil fields to prevent blowouts. It has the characteristics of simple structure, easy operation, and high pressure resistance, and is one of the important devices in the safety guarantee measures for drilling and workover operations. For a conventional single-cone surface sealed annular blowout preventer, the rubber core is not easy to be extruded inward, the upper plane rubber core of the single-cone surface annular blowout preventer is easily damaged, and the plane wear is serious, resulting in a low service life of the rubber core, affecting the sealing performance. At the same time, the electric control technology has increasingly become a trend in well control equipment, which can greatly simplify the complexity of the well control equipment control system. Therefore, it is necessary to design an annular blowout preventer with a rubber core that is easy to be extruded, adaptable to high well pressure, and has an increased service life of the rubber core, so as to achieve the purpose of replacing hydraulic control drive with electric drive.

[0003] Chinese patent document with publication number CN205297447U and publication date of June 8, 2016 discloses an oilfield drilling and workover annular blowout preventer, which includes an upper end cover, a housing, and a blowout preventer core body; the upper end cover is assembled with the housing through a bolt assembly; the blowout preventer core body is arranged in a cavity surrounded by the upper end cover and the housing, and a slip assembly, a vertically arranged rubber cylinder, and a torsion transfer cylinder made of rigid material are provided in the blowout preventer core body; the upper and lower ends of the rubber cylinder are respectively provided with an upper rubber cylinder torsion conduction shaft and a lower rubber cylinder torsion conduction shaft, the upper rubber cylinder torsion conduction shaft is of a hollow structure, and its inner wall is a conical surface for cooperating with the slip assembly; the torsion transfer cylinder is sleeved outside the rubber cylinder.

[0004] The oilfield drilling and workover annular blowout preventer disclosed in this patent document has the characteristics of strong high-pressure resistance, good general performance, and long service life, and is suitable for conventional downhole operations, pressure work, and underbalanced drilling operations. However, it is not easy to achieve sealing quickly, and the sealing effect is not good. Summary of the Invention

[0005] In order to overcome the above defects of the prior art, the present invention provides a double-cone surface sealed electric-driven annular blowout preventer. The structure of the present invention is stable, the sealing performance is good, it is easier to deform inward after being axially extruded to achieve sealing, the electric drive replaces the conventional hydraulic control drive, it is not affected by the ambient temperature, the installation is convenient, and the safety of using the blowout preventer is improved.

[0006] The present invention is realized through the following technical solutions: A double-cone surface sealed electric drive annular blowout preventer, comprising a housing, a support cylinder, a drive motor and a coupling. The housing is fixedly connected to the support cylinder. It is characterized in that: it further comprises a rotating sliding shaft, a sleeve is sleeved outside the rotating sliding shaft. The drive motor is connected to the rotating sliding shaft through the coupling. A conical piston and a connecting plate are arranged inside the housing. The conical piston is fixedly connected to the connecting plate. The sleeve is fitted on the connecting plate. A round nut is arranged at the lower part of the sleeve, and a limit nut is arranged at the upper part of the sleeve. A double-cone rubber core is arranged on the support cylinder, and a double-cone skeleton is embedded inside the double-cone rubber core. A conical top cover is connected to the housing, and a mud blocking ring is connected to the bottom of the conical top cover. The conical surface of the double-cone skeleton is matched with the conical surface of the conical top cover, and the conical surface of the conical piston is matched with the conical surface of the double-cone rubber core.

[0007] A piston lower sealing ring is arranged between the lower part of the conical piston and the housing, and a piston upper sealing ring is arranged between the conical piston and the conical top cover.

[0008] A mud blocking ring inner circle sealing ring is arranged between the conical piston and the mud blocking ring, and a mud blocking ring outer circle sealing ring is arranged between the mud blocking ring and the housing.

[0009] An upper tapered roller bearing sleeve and an upper tapered roller bearing end cover are arranged at the upper part of the housing. The upper tapered roller bearing sleeve and the upper tapered roller bearing end cover are fixed on the housing by screws.

[0010] An upper tapered roller bearing is arranged inside the upper tapered roller bearing sleeve, and an upper tapered roller bearing double nut is arranged on the upper tapered roller bearing.

[0011] A lower tapered roller bearing sleeve and a lower tapered roller bearing end cover are arranged at the lower part of the housing. The lower tapered roller bearing sleeve and the lower tapered roller bearing end cover are fixed on the housing by screws.

[0012] A lower tapered roller bearing is arranged inside the lower tapered roller bearing sleeve, and a lower tapered roller bearing double nut is arranged on the lower tapered roller bearing. The lower tapered roller bearing double nut is located between the coupling and the lower tapered roller bearing.

[0013] A cover plate is arranged on the housing, and the cover plate is detachably connected to the middle of the housing.

[0014] A conical top cover buckle is arranged between the conical top cover and the housing, and the conical top cover buckle is fixedly connected to the housing by screws.

[0015] The drive motor drives the rotating sliding shaft to rotate, and the rotating sliding shaft drives the conical piston to make reciprocating up and down movements.

[0016] The beneficial effects of the present invention are mainly shown in the following aspects: I. In the present invention, a sleeve is sleeved outside a rotating sliding shaft. A driving motor is connected to the rotating sliding shaft through a coupling. A conical piston and a connecting plate are arranged inside a housing body. The conical piston is fixedly connected to the connecting plate. The sleeve is fitted on the connecting plate. A round nut is arranged at the lower part of the sleeve, and a limit nut is arranged at the upper part of the sleeve. A double-conical rubber core is arranged on a support cylinder, and a double-conical skeleton is embedded inside the double-conical rubber core. A conical top cover is connected to the housing body, and a mud blocking ring is connected to the bottom of the conical top cover. The conical surface of the double-conical skeleton is matched with the conical surface of the conical top cover, and the conical surface of the conical piston is matched with the conical surface of the double-conical rubber core. Compared with the prior art, the structure is stable, the sealing performance is good, it is easier to achieve sealing by inward deformation after being axially extruded, the electric drive replaces the conventional hydraulic control drive, it is not affected by the ambient temperature, the installation is convenient, and the safety of using the blowout preventer is improved.

[0017] II. In the present invention, a piston lower sealing ring is arranged between the lower part of the conical piston and the housing body, and a piston upper sealing ring is arranged between the conical piston and the conical top cover, which can effectively ensure the sealing performance of the piston.

[0018] III. In the present invention, a mud blocking ring inner ring sealing ring is arranged between the conical piston and the mud blocking ring, and a mud blocking ring outer ring sealing ring is arranged between the mud blocking ring and the housing body, which can effectively ensure the sealing performance of the mud blocking ring.

[0019] IV. In the present invention, an upper tapered roller bearing sleeve and an upper tapered roller bearing end cover are arranged at the upper part of the housing body. The upper tapered roller bearing sleeve and the upper tapered roller bearing end cover are fixed on the housing body by screws, which can ensure the reliability of using the rotating sliding shaft.

[0020] V. In the present invention, an upper tapered roller bearing is arranged inside the upper tapered roller bearing sleeve, and an upper tapered roller bearing double nut is arranged on the upper tapered roller bearing, which can make the rotation of the rotating sliding shaft smoother.

[0021] VI. In the present invention, a lower tapered roller bearing sleeve and a lower tapered roller bearing end cover are arranged at the lower part of the housing body. The lower tapered roller bearing sleeve and the lower tapered roller bearing end cover are fixed on the housing body by screws, which can further ensure the reliability of using the rotating sliding shaft.

[0022] VII. In the present invention, a lower tapered roller bearing is arranged inside the lower tapered roller bearing sleeve, and a lower tapered roller bearing double nut is arranged on the lower tapered roller bearing. The lower tapered roller bearing double nut is located between the coupling and the lower tapered roller bearing, which can further improve the smoothness of the rotation of the rotating sliding shaft. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The present invention will be further specifically described below in conjunction with the specification drawings and specific embodiments, where: Figure 1 is the structural schematic diagram of the present invention; Markings in the figure: 1. Outer housing, 2. Support cylinder, 3. Driving motor, 4. Coupling, 5. Rotating sliding shaft, 6. Sleeve, 7. Tapered piston, 8. Connecting plate, 9. Round nut, 10. Limiting nut, 11. Double-tapered rubber core, 12. Double-tapered skeleton, 13. Tapered top cover, 14. Mud-blocking ring, 15. Lower piston sealing ring, 16. Upper piston sealing ring, 17. Inner sealing ring of mud-blocking ring, 18. Outer sealing ring of mud-blocking ring, 19. Upper tapered roller bearing sleeve, 20. Upper tapered roller bearing end cover, 21. Upper tapered roller bearing, 22. Double nuts for upper tapered roller bearing, 23. Lower tapered roller bearing sleeve, 24. Lower tapered roller bearing end cover, 25. Lower tapered roller bearing, 26. Double nuts for lower tapered roller bearing, 27. Cover plate, 28. Snap for tapered top cover. Specific implementation manner

[0024] Embodiment 1 See Figure 1 , a double-cone surface sealed electric-driven annular blowout preventer, comprising an outer housing 1, a support cylinder 2, a driving motor 3 and a coupling 4. The outer housing 1 is fixedly connected to the support cylinder 2. It further includes a rotating sliding shaft 5, and a sleeve 6 is sleeved outside the rotating sliding shaft 5. The driving motor 3 is connected to the rotating sliding shaft 5 through the coupling 4. A tapered piston 7 and a connecting plate 8 are arranged inside the outer housing 1, and the tapered piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limiting nut 10 is arranged at the upper part of the sleeve 6. A double-tapered rubber core 11 is arranged on the support cylinder 2, and a double-tapered skeleton 12 is embedded inside the double-tapered rubber core 11. A tapered top cover 13 is connected to the outer housing 1, and a mud-blocking ring 14 is connected to the bottom of the tapered top cover 13. The conical surface of the double-tapered skeleton 12 is matched with the conical surface of the tapered top cover 13, and the conical surface of the tapered piston 7 is matched with the conical surface of the double-tapered rubber core 11.

[0025] This embodiment is the most basic implementation mode. A sleeve 6 is sleeved outside the rotary sliding shaft 5. The drive motor 3 is connected to the rotary sliding shaft 5 through a coupling 4. A conical piston 7 and a connecting plate 8 are arranged inside the outer housing 1. The conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limit nut 10 is arranged at the upper part of the sleeve 6. A double-cone rubber core 11 is arranged on the support cylinder 2. A double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the outer housing 1. A mud-blocking ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double-cone rubber core 11. Compared with the prior art, the structure is stable, the sealing performance is good, and it is easier to achieve sealing by deforming inwards after being axially extruded. The electric drive replaces the conventional hydraulic control drive, is not affected by the ambient temperature, is convenient to install, and improves the safety of the blowout preventer.

[0026] Embodiment 2 See Figure 1 , a double-cone surface sealed electric drive annular blowout preventer, including an outer housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The outer housing 1 is fixedly connected to the support cylinder 2. It further includes a rotary sliding shaft 5. A sleeve 6 is sleeved outside the rotary sliding shaft 5. The drive motor 3 is connected to the rotary sliding shaft 5 through a coupling 4. A conical piston 7 and a connecting plate 8 are arranged inside the outer housing 1. The conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limit nut 10 is arranged at the upper part of the sleeve 6. A double-cone rubber core 11 is arranged on the support cylinder 2. A double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the outer housing 1. A mud-blocking ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double-cone rubber core 11.

[0027] Preferably, a piston lower sealing ring 15 is arranged between the lower part of the conical piston 7 and the outer housing 1, and a piston upper sealing ring 16 is arranged between the conical piston 7 and the conical top cover 13.

[0028] This embodiment is a preferred implementation mode. A piston lower sealing ring 15 is arranged between the lower part of the conical piston 7 and the outer housing 1, and a piston upper sealing ring 16 is arranged between the conical piston 7 and the conical top cover 13, which can effectively ensure the sealing performance of the piston.

[0029] Embodiment 3 See Figure 1, A double-cone surface sealed electric drive annular blowout preventer, comprising a housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The housing 1 is fixedly connected to the support cylinder 2. It further includes a rotating sliding shaft 5, and a sleeve 6 is sleeved outside the rotating sliding shaft 5. The drive motor 3 is connected to the rotating sliding shaft 5 through the coupling 4. A conical piston 7 and a connecting plate 8 are arranged inside the housing 1. The conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limit nut 10 is arranged at the upper part of the sleeve 6. A double-cone rubber core 11 is arranged on the support cylinder 2, and a double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the housing 1, and a mud guard ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double-cone rubber core 11.

[0030] A piston lower sealing ring 15 is arranged between the lower part of the conical piston 7 and the housing 1, and a piston upper sealing ring 16 is arranged between the conical piston 7 and the conical top cover 13.

[0031] Further preferably, a mud guard ring inner sealing ring 17 is arranged between the conical piston 7 and the mud guard ring 14, and a mud guard ring outer sealing ring 18 is arranged between the mud guard ring 14 and the housing 1.

[0032] This embodiment is another preferred embodiment. A mud guard ring inner sealing ring 17 is arranged between the conical piston 7 and the mud guard ring 14, and a mud guard ring outer sealing ring 18 is arranged between the mud guard ring 14 and the housing 1, which can effectively ensure the sealing performance of the mud guard ring 14.

[0033] Embodiment 4 See Figure 1 , A double-cone surface sealed electric drive annular blowout preventer, comprising a housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The housing 1 is fixedly connected to the support cylinder 2. It further includes a rotating sliding shaft 5, and a sleeve 6 is sleeved outside the rotating sliding shaft 5. The drive motor 3 is connected to the rotating sliding shaft 5 through the coupling 4. A conical piston 7 and a connecting plate 8 are arranged inside the housing 1. The conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limit nut 10 is arranged at the upper part of the sleeve 6. A double-cone rubber core 11 is arranged on the support cylinder 2, and a double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the housing 1, and a mud guard ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double-cone rubber core 11.

[0034] A piston lower seal ring 15 is arranged between the lower part of the conical piston 7 and the outer housing 1, and a piston upper seal ring 16 is arranged between the conical piston 7 and the conical top cover 13.

[0035] A sludge-blocking ring inner seal ring 17 is arranged between the conical piston 7 and the sludge-blocking ring 14, and a sludge-blocking ring outer seal ring 18 is arranged between the sludge-blocking ring 14 and the outer housing 1.

[0036] An upper tapered roller bearing sleeve 19 and an upper tapered roller bearing end cover 20 are arranged on the upper part of the outer housing 1, and the upper tapered roller bearing sleeve 19 and the upper tapered roller bearing end cover 20 are fixed on the outer housing 1 by screws.

[0037] This embodiment is another preferred embodiment. An upper tapered roller bearing sleeve 19 and an upper tapered roller bearing end cover 20 are arranged on the upper part of the outer housing 1, and the upper tapered roller bearing sleeve 19 and the upper tapered roller bearing end cover 20 are fixed on the outer housing 1 by screws, which can ensure the reliability of the rotating sliding shaft 5.

[0038] Embodiment 5 See Figure 1 , a double-cone surface sealed electric-driven annular blowout preventer, comprising an outer housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The outer housing 1 is fixedly connected with the support cylinder 2, and further comprises a rotating sliding shaft 5. A sleeve 6 is sleeved outside the rotating sliding shaft 5. The drive motor 3 is connected with the rotating sliding shaft 5 through the coupling 4. A conical piston 7 and a connecting plate 8 are arranged in the outer housing 1. The conical piston 7 is fixedly connected with the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is arranged at the lower part of the sleeve 6, and a limit nut 10 is arranged at the upper part of the sleeve 6. A double-cone rubber core 11 is arranged on the support cylinder 2, and a double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the outer housing 1, and a sludge-blocking ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double-cone rubber core 11.

[0039] A piston lower seal ring 15 is arranged between the lower part of the conical piston 7 and the outer housing 1, and a piston upper seal ring 16 is arranged between the conical piston 7 and the conical top cover 13.

[0040] A sludge-blocking ring inner seal ring 17 is arranged between the conical piston 7 and the sludge-blocking ring 14, and a sludge-blocking ring outer seal ring 18 is arranged between the sludge-blocking ring 14 and the outer housing 1.

[0041] An upper tapered roller bearing sleeve 19 and an upper tapered roller bearing end cover 20 are arranged on the upper part of the outer housing 1, and the upper tapered roller bearing sleeve 19 and the upper tapered roller bearing end cover 20 are fixed on the outer housing 1 by screws.

[0042] Further preferably, an upper tapered roller bearing 21 is disposed inside the upper tapered roller bearing sleeve 19, and an upper tapered roller bearing double nut 22 is disposed on the upper tapered roller bearing 21.

[0043] In this embodiment, which is another preferred embodiment, an upper tapered roller bearing 21 is disposed inside the upper tapered roller bearing sleeve 19, and an upper tapered roller bearing double nut 22 is disposed on the upper tapered roller bearing 21, enabling the rotary sliding shaft 5 to rotate more smoothly.

[0044] Embodiment 6 See Figure 1 , a double - conical - surface - sealed electric - driven annular blowout preventer, comprising a housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The housing 1 is fixedly connected to the support cylinder 2. It further includes a rotary sliding shaft 5, and a sleeve 6 is sleeved outside the rotary sliding shaft 5. The drive motor 3 is connected to the rotary sliding shaft 5 through the coupling 4. A conical piston 7 and a connecting plate 8 are disposed inside the housing 1, and the conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is disposed at the lower part of the sleeve 6, and a limit nut 10 is disposed at the upper part of the sleeve 6. A double - conical rubber core 11 is disposed on the support cylinder 2, and a double - conical skeleton 12 is embedded inside the double - conical rubber core 11. A conical top cover 13 is connected to the housing 1, and a mud - blocking ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double - conical skeleton 12 is matched with the conical surface of the conical top cover 13, and the conical surface of the conical piston 7 is matched with the conical surface of the double - conical rubber core 11.

[0045] A piston lower sealing ring 15 is disposed between the lower part of the conical piston 7 and the housing 1, and a piston upper sealing ring 16 is disposed between the conical piston 7 and the conical top cover 13.

[0046] A mud - blocking ring inner - circle sealing ring 17 is disposed between the conical piston 7 and the mud - blocking ring 14, and a mud - blocking ring outer - circle sealing ring 18 is disposed between the mud - blocking ring 14 and the housing 1.

[0047] An upper tapered roller bearing sleeve 19 and an upper tapered roller bearing end cover 20 are disposed at the upper part of the housing 1, and the upper tapered roller bearing sleeve 19 and the upper tapered roller bearing end cover 20 are fixed to the housing 1 by screws.

[0048] An upper tapered roller bearing 21 is disposed inside the upper tapered roller bearing sleeve 19, and an upper tapered roller bearing double nut 22 is disposed on the upper tapered roller bearing 21.

[0049] A lower tapered roller bearing sleeve 23 and a lower tapered roller bearing end cover 24 are disposed at the lower part of the housing 1, and the lower tapered roller bearing sleeve 23 and the lower tapered roller bearing end cover 24 are fixed to the housing 1 by screws.

[0050] This embodiment is another preferred embodiment. A lower conical roller bearing sleeve 23 and a lower conical roller bearing end cover 24 are provided at the lower part of the outer housing 1. The lower conical roller bearing sleeve 23 and the lower conical roller bearing end cover 24 are fixed to the outer housing 1 by screws, which can further ensure the reliability of the use of the rotating sliding shaft 5.

[0051] Embodiment 7 See Figure 1 , a double-cone surface sealed electric-driven annular blowout preventer, comprising an outer housing 1, a support cylinder 2, a drive motor 3 and a coupling 4. The outer housing 1 is fixedly connected to the support cylinder 2. It further includes a rotating sliding shaft 5. A sleeve 6 is sleeved outside the rotating sliding shaft 5. The drive motor 3 is connected to the rotating sliding shaft 5 through the coupling 4. A conical piston 7 and a connecting plate 8 are arranged inside the outer housing 1. The conical piston 7 is fixedly connected to the connecting plate 8. The sleeve 6 is fitted on the connecting plate 8. A round nut 9 is provided at the lower part of the sleeve 6, and a limit nut 10 is provided at the upper part of the sleeve 6. A double-cone rubber core 11 is provided on the support cylinder 2. A double-cone skeleton 12 is embedded inside the double-cone rubber core 11. A conical top cover 13 is connected to the outer housing 1. A mud guard ring 14 is connected to the bottom of the conical top cover 13. The conical surface of the double-cone skeleton 12 cooperates with the conical surface of the conical top cover 13. The conical surface of the conical piston 7 cooperates with the conical surface of the double-cone rubber core 11.

[0052] A piston lower sealing ring 15 is provided between the lower part of the conical piston 7 and the outer housing 1, and a piston upper sealing ring 16 is provided between the conical piston 7 and the conical top cover 13.

[0053] A mud guard ring inner sealing ring 17 is provided between the conical piston 7 and the mud guard ring 14, and a mud guard ring outer sealing ring 18 is provided between the mud guard ring 14 and the outer housing 1.

[0054] An upper conical roller bearing sleeve 19 and an upper conical roller bearing end cover 20 are provided at the upper part of the outer housing 1. The upper conical roller bearing sleeve 19 and the upper conical roller bearing end cover 20 are fixed to the outer housing 1 by screws.

[0055] An upper conical roller bearing 21 is provided inside the upper conical roller bearing sleeve 19, and an upper conical roller bearing double nut 22 is provided on the upper conical roller bearing 21.

[0056] A lower conical roller bearing sleeve 23 and a lower conical roller bearing end cover 24 are provided at the lower part of the outer housing 1. The lower conical roller bearing sleeve 23 and the lower conical roller bearing end cover 24 are fixed to the outer housing 1 by screws.

[0057] Further preferably, a lower tapered roller bearing 25 is provided inside the lower tapered roller bearing sleeve 23, and a double nut for the lower tapered roller bearing 26 is provided on the lower tapered roller bearing 25. The double nut for the lower tapered roller bearing 26 is located between the coupling 4 and the lower tapered roller bearing 25.

[0058] A cover plate 27 is provided on the outer housing 1, and the cover plate 27 is detachably connected to the middle of the outer housing 1.

[0059] A snap fastener for the conical top cover 28 is provided between the conical top cover 13 and the outer housing 1, and the snap fastener for the conical top cover 28 is fixedly connected to the outer housing 1 by screws.

[0060] The drive motor 3 drives the rotary sliding shaft 5 to rotate, and the rotary sliding shaft 5 drives the conical piston 7 to move up and down reciprocally.

[0061] This embodiment is the best implementation mode. A lower tapered roller bearing 25 is provided inside the lower tapered roller bearing sleeve 23, and a double nut for the lower tapered roller bearing 26 is provided on the lower tapered roller bearing 25. The double nut for the lower tapered roller bearing 26 is located between the coupling 4 and the lower tapered roller bearing 25, which can further improve the smooth rotation of the rotary sliding shaft 5.

[0062] The working principle of the present invention is as follows: A double nut for the lower tapered roller bearing 26 is provided between the coupling 4 and the lower tapered roller bearing 25. The sleeve 6 and the piston connecting plate 8 are matched through an annular groove. A round nut 9 is provided at the lower part of the sleeve 6, and there is a gap between the round nut 9 and the connecting plate 8 of the conical piston 7. A limit nut 10 is provided at the upper part of the sleeve 6, and an auxiliary threaded hole is provided on the limit nut 10. There is a gap between the limit nut 10 and the upper tapered roller bearing 21. The limit nut 10 and the outer housing 1 are matched through a limit groove. The circumferential direction of the limit nut 10 is positioned by a profile. A double nut for the upper tapered roller bearing 22 is provided on the upper tapered roller bearing 21. During operation, the drive motor 3 drives the rotary sliding shaft 5 to rotate through the coupling 4. The sleeve 6 on the rotary sliding shaft 5 moves upward to drive the conical piston 7 to also move upward. When the oil pressure assist seal at the lower part of the conical piston 7 is too high, the limit nut 10 will limit the sleeve 6 from continuing to drive the conical piston 7 upward. When the conical piston 7 moves downward, the required force is smaller, and the drive motor 3 rotates in the reverse direction to drive the round nut 9 to move downward to drive the conical piston 7 to move downward.

[0063] The conical surface of the double conical skeleton 12 is matched with the conical surface of the conical top cover 13. The double conical skeleton 12 is embedded inside the double conical rubber core 11. The conical surface of the conical piston 7 is matched with the conical surface of the double conical rubber core 11. When the conical piston 7 moves upward, due to the matching of the conical surface of the double conical skeleton 12 and the conical surface of the conical top cover 13, when the conical piston 7 squeezes the double conical rubber core 11, the rubber on the side of the double conical rubber core 11 is more easily extruded, and the double sides deform inward simultaneously, and the deformation is more coordinated.

Claims

1. A double-cone surface sealed electric drive annular blowout preventer, comprising a housing (1), a support cylinder (2), a drive motor (3) and a coupling (4), the housing (1) being fixedly connected to the support cylinder (2), characterized in that: It further includes a rotating sliding shaft (5), and a sleeve (6) is sleeved outside the rotating sliding shaft (5). The driving motor (3) is connected to the rotating sliding shaft (5) through a coupling (4). A conical piston (7) and a connecting plate (8) are arranged inside the outer housing (1). The conical piston (7) is fixedly connected to the connecting plate (8). The sleeve (6) is fitted on the connecting plate (8). A round nut (9) is arranged at the lower part of the sleeve (6), and a limit nut (10) is arranged at the upper part of the sleeve (6). A double-cone rubber core (11) is arranged on the support cylinder (2), and a double-cone skeleton (12) is embedded inside the double-cone rubber core (11). A conical top cover (13) is connected to the outer housing (1), and a mud blocking ring (14) is connected to the bottom of the conical top cover (13). The conical surface of the double-cone skeleton (12) is matched with the conical surface of the conical top cover (13), and the conical surface of the conical piston (7) is matched with the conical surface of the double-cone rubber core (11).

2. The double-cone surface sealed electric-driven annular blowout preventer according to claim 1, wherein: A piston lower sealing ring (15) is arranged between the lower part of the conical piston (7) and the outer housing (1), and a piston upper sealing ring (16) is arranged between the conical piston (7) and the conical top cover (13).

3. A double-cone surface sealed electric drive annular blowout preventer according to claim 1, characterized in that: A mud blocking ring inner circle sealing ring (17) is arranged between the conical piston (7) and the mud blocking ring (14), and a mud blocking ring outer circle sealing ring (18) is arranged between the mud blocking ring (14) and the outer housing (1).

4. A double-cone surface sealed electric-driven annular blowout preventer according to claim 1, characterized in that: An upper tapered roller bearing sleeve (19) and an upper tapered roller bearing end cover (20) are arranged at the upper part of the outer housing (1), and the upper tapered roller bearing sleeve (19) and the upper tapered roller bearing end cover (20) are fixed on the outer housing (1) by screws.

5. The double-cone surface sealed electric drive annular blowout preventer according to claim 4, characterized in that: An upper tapered roller bearing (21) is arranged inside the upper tapered roller bearing sleeve (19), and an upper tapered roller bearing double nut (22) is arranged on the upper tapered roller bearing (21).

6. A double-cone surface sealed electric drive annular blowout preventer according to claim 1, characterized in that: A lower tapered roller bearing sleeve (23) and a lower tapered roller bearing end cover (24) are arranged at the lower part of the outer housing (1), and the lower tapered roller bearing sleeve (23) and the lower tapered roller bearing end cover (24) are fixed on the outer housing (1) by screws.

7. A double-cone surface sealed electric drive annular blowout preventer according to claim 6, characterized in that: A lower tapered roller bearing (25) is arranged inside the lower tapered roller bearing sleeve (23), and a lower tapered roller bearing double nut (26) is arranged on the lower tapered roller bearing (25). The lower tapered roller bearing double nut (26) is located between the coupling (4) and the lower tapered roller bearing (25).

8. A double-cone surface sealed electric-driven annular blowout preventer according to claim 1, characterized in that: A cover plate (27) is arranged on the outer housing (1), and the cover plate (27) is detachably connected to the middle of the outer housing (1).

9. A double-cone surface sealed electric drive annular blowout preventer according to claim 1, characterized in that: A conical top cover buckle (28) is arranged between the conical top cover (13) and the outer housing (1), and the conical top cover buckle (28) is fixedly connected to the outer housing (1) by screws.

10. A double-cone surface sealed electric drive annular blowout preventer according to claim 1, characterized in that: The driving motor (3) drives the rotating sliding shaft (5) to rotate, and the rotating sliding shaft (5) drives the conical piston (7) to make reciprocating up and down movements.

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