A combined bearing type large-size movable elbow mechanism

Abstract

The present invention discloses a combined bearing type large-size movable elbow mechanism, including an elbow, a connector, a gland, a packing seal assembly and a rotating assembly. The elbow and the connector, and the elbows are fixedly connected by the gland and sealed by the packing seal assembly. A cavity is formed between the gland and the connector, and between the gland and the elbow. The rotating assembly is installed in the cavity. The rotating assembly is used for the relative rotation of the connector or the elbow. The rotating assembly includes a radial bearing and a thrust bearing. The elbow and the connector, and the elbows are flexibly connected. Beneficial effects: flexible connection, smooth rotation, simple structure, not limited by pipe diameter, not limited by the molding method of the elbow structure, small size, and diversified molding methods.

Description

Technical Field

[0001] The invention relates to the technical field of manifold connection, and in particular to a combined bearing type large-size movable elbow mechanism. Background Art

[0002] The original movable elbow structure is generally designed with multiple grooves, and a certain number of rolling elements are installed inside the grooves to achieve relative rotation of the joints at both ends around the axis; the rolling elements in each groove are installed from their respective mounting holes, and each mounting hole is designed with a plug and a retaining ring to prevent the rolling elements from scattering during rotation. This structure that realizes the rotation function is large in size, complex in structure, and difficult to assemble. It has high requirements for the length of the straight section in the elbow structure and is suitable for small-sized movable elbows. When the specifications increase, the structure that uses rolling elements to achieve the rotation function is no longer applicable due to the limited molding method and volume requirements of the elbow structure.

[0003] With the rise of shale gas operations in domestic and foreign oil and gas fields, the characteristics of high pressure, large displacement and continuous operation have placed increasingly stringent requirements on fracturing equipment. In order to meet the needs of shale gas operations, electric fracturing has gradually emerged and applied, the displacement of a single pump has increased sharply, and large-diameter manifolds with flange connections have also emerged. In order to compensate for the distance difference between large-diameter manifold skids, achieve flexible connections between manifold skids at different heights and distances, and avoid the huge impact and vibration caused by rigid pipeline connections, thereby causing premature damage to manifold components, it is necessary to develop a flexible connection device for the connection between large-diameter manifold skids and wellhead manifolds. Summary of the invention

[0004] The purpose of the present invention is to overcome the shortcomings of the prior art and provide a combined bearing type large-scale movable elbow mechanism. The sealing and leakage prevention between the circulation components in the combined bearing type large-scale movable elbow mechanism is realized by a packing seal assembly. The fixed connection between the circulation components in the combined bearing type large-scale movable elbow mechanism is realized by a gland. The centripetal bearing and thrust bearing of the rotating assembly can simultaneously bear the huge axial load in the working process and the radial load in the rotation process, ensuring the smooth relative rotation between the circulation components in the combined bearing type large-scale movable elbow mechanism, making it more convenient to connect with upstream and downstream equipment, and also can well alleviate the vibration generated by the pipeline in the process of conveying high-pressure and high-speed fluids, release stress, and avoid fatigue stress caused by rigid connection. According to the different distance differences required for actual connection, different numbers of elbows are connected, and the adaptability is wide. The flexible connection better meets the high pressure, large displacement, and continuous operation requirements of shale gas operations. The rotation mode of the combined bearing type large-scale movable elbow mechanism is simple in structure and flexible in rotation. It is not limited by the pipe diameter or the molding method of the elbow structure. The combined bearing type large-scale movable elbow mechanism has a small volume and a variety of molding methods.

[0005] The objective of the present invention is achieved through the following technical measures: a combined bearing type large-size movable elbow mechanism, comprising an elbow, a connector, a gland, a packing sealing assembly and a rotating assembly, wherein the elbow and the connector, and the elbows are fixedly connected by the gland and sealed by the packing sealing assembly, a cavity is formed between the gland and the connector, and between the gland and the elbow, a rotating assembly is installed in the cavity, the rotating assembly is used for relative rotation of the connector or the elbow, the rotating assembly comprises a radial bearing and a thrust bearing, and the elbow and the connector, and the elbows are flexibly connected.

[0006] Furthermore, the radial bearing is a cylindrical roller bearing or a needle roller bearing.

[0007] Furthermore, the thrust bearing is a tapered roller bearing or a thrust ball bearing.

[0008] Furthermore, the connector adopts an API flange to connect with the upstream device or the downstream device.

[0009] Furthermore, different numbers of the elbows are connected according to actual use requirements.

[0010] Furthermore, the packing sealing assembly includes packing, a support ring and a pressure ring, the packing is used to seal the connection between the elbow and the connector, the packing is used to seal the connection between the elbows, the support ring is connected to the packing, and the pressure ring is used to compress the packing.

[0011] Furthermore, a stopper and a sealing block are provided in the cavity, one end of the stopper is connected to the packing sealing assembly through the sealing block, the other end of the stopper is in contact with the rotating assembly, and the stopper is threadedly connected to the elbow or the connector.

[0012] Furthermore, the stopper provides an axial thrust for the thrust bearing, and the thread strength of the stopper satisfies the maximum axial thrust required by the thrust bearing.

[0013] Further, when the connector is connected to the elbow, the sealing block is respectively sealed and connected to the connector and the elbow; when the elbow is connected to the elbow, the sealing block is respectively sealed and connected to the two elbows.

[0014] Furthermore, a plurality of inclined holes are provided on the combined bearing type large-size movable elbow mechanism, the inclined holes correspond to the positions of the sealing blocks, and the inclined holes are used to observe whether the seal of the packing sealing assembly leaks.

[0015] Furthermore, a plurality of oil filling ports are provided on the combined bearing type large-size movable elbow mechanism, and the oil filling ports are respectively used for lubricating the packing seal assembly and the rotating assembly.

[0016] Furthermore, the gland is sealed and connected to the elbow or connector.

[0017] Furthermore, the gland is fixed to the elbow or connector by bolts.

[0018] Furthermore, the elbow is a two-way joint, a three-way joint, a four-way joint, a Y-shaped three-way joint, or a forked three-way joint.

[0019] Compared with the prior art, the beneficial effects of the present invention are: the sealing and leakage prevention between the circulation components of the combined bearing type large-scale movable elbow mechanism is realized by the packing seal assembly, the fixed connection between the circulation components of the combined bearing type large-scale movable elbow mechanism is realized by the pressure cover, and the huge axial load in the working process and the radial load in the rotation process can be simultaneously borne by the radial bearing and thrust bearing of the rotating assembly, so as to ensure the smooth relative rotation between the circulation components in the combined bearing type large-scale movable elbow mechanism, and more convenient to connect with the upstream and downstream equipment, and can also well alleviate the vibration generated by the pipeline in the process of conveying high-pressure and high-speed fluid, release stress, and avoid fatigue stress caused by rigid connection. According to the different distance differences required for actual connection, different numbers of elbows are connected, and the adaptability is wide. The flexible connection better meets the high pressure, large displacement and continuous operation requirements of shale gas operations. The rotation mode of the combined bearing type large-scale movable elbow mechanism is simple in structure and flexible in rotation. It is not limited by the pipe diameter or the molding method of the elbow structure. The combined bearing type large-scale movable elbow mechanism has a small volume and a variety of molding methods.

[0020] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a structural schematic diagram of a combined bearing type large-size movable elbow mechanism.

[0022] Figure 2 yes Figure 1 A partial enlarged view of part I in the middle.

[0023] Figure 3 yes Figure 1 Schematic diagram of the external structure.

[0024] Figure 4 It is a structural diagram of another embodiment of a combined bearing type large-size movable elbow mechanism.

[0025] Among them, 1. elbow, 2. packing seal assembly, 3. first sealing ring, 4. sealing block, 5. second sealing ring, 6. stopper, 7. fourth sealing ring, 8. bolt, 9. thrust bearing, 10. radial bearing, 11. pressure cover, 12. third sealing ring, 13. connector, 14. inclined hole, 15. first elbow, 16. second elbow, 17. first connector, 18. second connector. DETAILED DESCRIPTION

[0026] like Figures 1 to 4 As shown, a combined bearing type large-scale movable elbow mechanism, a combined bearing type large-scale movable elbow mechanism, includes an elbow 1, a connector 13, a gland 11, a packing seal assembly 2 and a rotating assembly, the elbow 1 and the connector 13, the elbow 1 and the elbow 1 are fixedly connected by the gland 11 and sealed by the packing seal assembly 2, a cavity is formed between the gland 11 and the connector 13, and the gland 11 and the elbow 1, and a rotating assembly is installed in the cavity, and the rotating assembly is used for the relative rotation of the connector 13 or the elbow 1, the rotating assembly includes a radial bearing 10 and a thrust bearing 9, and the elbow 1 and the connector 13 are flexibly connected. According to actual use needs, different numbers of the elbows 1 are connected. According to the different distance differences required for actual connection, different numbers of combination forms can realize various manifold forms of connection, improve the convenience of well site layout, and have wide adaptability. Flexible connection better meets the needs of high pressure, large displacement, and continuous operation of shale gas operations. The sealing and leakage prevention between the circulation components in the combined bearing type large-scale movable elbow mechanism is realized by the packing seal assembly 2, and the fixed connection between the circulation components in the combined bearing type large-scale movable elbow mechanism is realized by the pressure cover 11. The radial bearing 10 and the thrust bearing 9 of the rotating assembly can simultaneously withstand the huge axial load during the working process and the radial load during the rotation process, ensuring the smooth relative rotation between the circulation components in the combined bearing type large-scale movable elbow mechanism. The circulation components here refer to the components used for various high-pressure and high-speed fluids in the circulation pipeline, and specifically refer to the connector 13 and the elbow 1 in this combined bearing type large-scale movable elbow mechanism, excluding the pressure cover 11, the packing seal assembly 2 and the rotating assembly.

[0027] The radial bearing 10 is a cylindrical roller bearing or a needle roller bearing.

[0028] The thrust bearing 9 is a tapered roller bearing or a thrust ball bearing. The thrust bearing 9 is used to withstand the axial force caused by the high pressure of the medium in the system. A large inner hole and a small inner hole coaxially arranged inside the gland 11, the small inner hole cooperates with the radial bearing 10, and the large inner hole cooperates with the thrust bearing 9, providing support for the thrust bearing 9 during operation.

[0029] The connector 13 is connected to the upstream equipment or downstream equipment by API flange. The API flange is universal and interchangeable, and can be directly and seamlessly connected to other similar equipment used in oil and gas fields.

[0030] The packing sealing assembly 2 includes packing, a support ring and a pressure ring. The packing is used to seal the connection between the elbow 1 and the connector 13, the packing is used to seal the connection between the elbow 1 and the elbow 1, the support ring is connected to the packing, and the pressure ring is used to compress the packing.

[0031] A stopper 6 and a sealing block 4 are provided in the cavity. One end of the stopper 6 is connected to the packing sealing assembly 2 through the sealing block 4 , and the other end of the stopper 6 is in contact with the rotating assembly. The stopper 6 is threadedly connected to the elbow 1 or the connector 13 .

[0032] The stopper 6 provides an axial thrust for the thrust bearing 9 , and the thread strength of the stopper 6 satisfies the maximum axial thrust required by the thrust bearing 9 .

[0033] When the connector 13 is connected to the elbow 1 , the sealing block 4 is sealed and connected to the connector 13 and the elbow 1 respectively; when the elbow 1 is connected to the elbow 1 , the sealing block 4 is sealed and connected to the two elbows 1 respectively.

[0034] A plurality of inclined holes 14 are provided on the combined bearing type large-size movable elbow mechanism. The inclined holes 14 correspond to the positions of the sealing blocks 4 . The inclined holes 14 are used to observe whether the seal of the packing seal assembly 2 is leaking.

[0035] A plurality of oil filling ports are provided on the combined bearing type large-size movable elbow mechanism, and the oil filling ports are respectively used for lubricating the packing seal assembly 2 and the rotating assembly.

[0036] The gland 11 is sealed and connected to the elbow 1 or the connector 13 .

[0037] The gland 11 is fixed to the elbow 1 or the connector 13 by bolts 8 .

[0038] In order to be suitable for different occasions and realize connections of different forms and directions, the elbow 1 can be designed into different structures and shapes, such as a two-way joint, a three-way joint, a four-way joint, a Y-type three-way joint, a forked three-way joint, etc.

[0039] In this application, Figure 3 and Figure 4 These are only two embodiments of the present technical solution. Taking embodiment 1 as an example, the present technical solution is explained in detail. Figure 3In the embodiment, the elbow 1 includes a first elbow 15 and a second elbow 16, and the connector 13 includes a first connector 17 and a second connector 18. The first connector 17 is connected to the first elbow 15, the second elbow 16 and the second connector 18 in sequence, and the other ends of the first connector 17 and the second connector 18 are connected to the upstream device and the downstream device respectively. When the upstream device and the downstream device need to be connected, the first connector 17 can rotate relative to the first elbow 15, and the second connector 18 can rotate relative to the second elbow 16, so as to achieve docking faster and more flexibly. In actual transportation work, the first connector 17 and the second connector 18 are fixedly connected to the upstream and downstream devices, but the first elbow 15 and the second elbow 16 can rotate relative to each other. Specifically, the first elbow 15 can rotate relative to the first connector 17 and the second elbow 16; the second elbow 16 can rotate relative to the first elbow 15 and the second connector 18. The free rotation of the first elbow 15 and the second elbow 16 can alleviate the vibration generated by the pipeline during the transportation of high-pressure and high-speed fluids, release stress, avoid fatigue stress caused by rigid connection, and increase the service life of the elbow structure.

[0040] The packing seal assembly 2 is used for sealing connection between the first connector 17 and the first elbow 15, between the first elbow 15 and the second elbow 16, and between the second elbow 16 and the first connector 17. The gland 11 is used for fixed connection between the first connector 17 and the first elbow 15, between the first elbow 15 and the second elbow 16, and between the second elbow 16 and the first connector 17. The rotating assembly is respectively arranged in the cavity formed between the first connector 17 and the first elbow 15, between the first elbow 15 and the second elbow 16, and between the second elbow 16 and the first connector 17. Between the first connector 17 and the first elbow 15, the gland 11 is fixed to the first elbow 15 by bolts 8; between the second elbow 16 and the second connector 18, the gland 11 is fixed to the second connector 18 by bolts 8. The packing seal assembly 2 is a combined sealing ring, which achieves initial sealing through its own deformation. When there is internal pressure in the pipeline, the fluid medium pressure will increase the compression of the packing to achieve auxiliary sealing, thereby preventing leakage of the internal fluid medium. The packing seal assembly 2 is an important sealing assembly of the combined bearing type large-size movable elbow mechanism, and its service life greatly affects the operating efficiency. Super wear-resistant materials are selected to prevent failure caused by wear during relative rotational motion; and self-lubrication is added (the oil filling port corresponding to the packing seal assembly 2 is achieved by injecting lubricating oil), which can greatly reduce the friction resistance during the relative rotation of the first elbow 15 and the second elbow 16.

[0041] Taking the connection between the first elbow 15 and the second elbow 16 as an example, the connection relationship of each component is further explained in detail. One end of the second elbow 16 extends into the hollow cavity of the first elbow 15, and is fixed to the first elbow 15 by bolts 8 through the gland 11. A packing seal assembly 2 is provided at the connection between the second elbow 16 and the first elbow 15. In the cavity formed by the gland 11 and the second elbow 16, a sealing block 4, a stopper 6 and a rotating assembly are installed in sequence. The sealing block 4 is sealed and connected to the first elbow 15 through the first sealing ring 3, the sealing block 4 is sealed and connected to the second elbow 16 through the second sealing ring 5, and the stopper 6 is connected to the external thread of the second elbow 16. The gland 11 is sealed and connected to the second elbow 16 through the third sealing ring 12, and the gland 11 is sealed and connected to the first elbow 15 through the fourth sealing ring 7. The third sealing ring 12 and the fourth sealing ring 7 are used to achieve the sealing of the cavity and the outside of the rotating assembly to prevent the loss of internal lubricating oil and the entry of external impurities and dust. The first sealing ring 3 and the second sealing ring 5 are used to prevent the internal fluid sealed by the packing seal assembly 2 from leaking into the cavity of the rotating assembly, and also to prevent the leakage of the lubricating oil of the packing seal assembly 2. The sealing block 4 is installed in the annular cavity formed by the connection of the first elbow 15 and the second elbow 16, and is used to provide axial support for the packing seal assembly 2; the sealing block 4 is made of special wear-resistant material to reduce friction and wear during relative rotation.

[0042] An oblique hole 14 is provided on the first elbow 15 , and the oblique hole 14 leads to the sealing block 4 , and is used to detect whether the seal of the packing sealing assembly 2 has leakage.

[0043] When the packing seal assembly 2 fails, the fluid medium in the pipeline will be discharged from the inclined hole 14, alerting the staff that the packing seal assembly 2 has failed and needs to be replaced immediately. An oil filling port is provided on the first elbow 15 and the gland 11, and the oil filling port is sealed by a screw plug.

[0044] Those skilled in the art should understand that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, and these changes and improvements fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A combined bearing type large-size movable elbow mechanism, characterized in that: It includes an elbow, a connector, a gland, a packing sealing assembly and a rotating assembly. The elbow and the connector, and the elbows are fixedly connected by the gland and sealed by the packing sealing assembly. A cavity is formed between the gland and the connector, and between the gland and the elbow. The rotating assembly is installed in the cavity. The rotating assembly is used for the relative rotation of the connector or the elbow. The rotating assembly includes a radial bearing and a thrust bearing. The elbow and the connector, and the elbows are flexibly connected. A stopper and a sealing block are arranged in the cavity. One end of the stopper is connected to the packing sealing assembly through the sealing block, and the other end of the stopper contacts the rotating assembly. The stopper is threadedly connected to the elbow or the connector. The stopper provides an axial thrust for the thrust bearing, and the thread strength of the stopper meets the maximum axial thrust required by the thrust bearing. When the connector is connected to the elbow, the sealing block is sealed and connected to the connector and the elbow respectively. When the elbows are connected to each other, the sealing block is sealed and connected to the two elbows respectively.

2. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: The radial bearing is a cylindrical roller bearing or a needle roller bearing.

3. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: The thrust bearing is a tapered roller bearing or a thrust ball bearing.

4. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: The connector adopts API flange to connect with upstream equipment or downstream equipment.

5. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: Different numbers of the elbows are connected according to actual use requirements.

6. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: The packing sealing assembly includes packing, a support ring and a pressure ring. The packing is used to seal the connection between the elbow and the connector, the packing is used to seal the connection between the elbows, the support ring is connected to the packing, and the pressure ring is used to compress the packing.

7. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: A plurality of inclined holes are provided on the combined bearing type large-size movable elbow mechanism, the inclined holes correspond to the positions of the sealing blocks, and the inclined holes are used to observe whether the seal of the packing sealing assembly leaks.

8. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: A plurality of oil filling ports are provided on the combined bearing type large-size movable elbow mechanism, and the oil filling ports are respectively used for lubricating the packing seal assembly and the rotating assembly.

9. The combined bearing type large-size movable elbow mechanism according to claim 1 is characterized in that: The gland is sealed and connected to the elbow or connector.

10. The combined bearing type large-size movable elbow mechanism according to claim 1, characterized in that: The gland is fixed to the elbow or connector by bolts.

11. The combined bearing type large-size movable elbow mechanism according to claim 1, characterized in that: The elbow is a two-way joint, a four-way joint, a Y-shaped three-way joint, or a forked three-way joint.

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