Underwater Christmas tree with protection device

Abstract

The invention discloses a subsea Christmas tree with a protection device, and relates to the related technical field of subsea Christmas trees, a Christmas tree body and the protection device are connected in advance and integrally put down for installation, the offshore operation time is shortened, and the installation efficiency is improved; the bottom shield has automatic unlocking, unfolding and fixing functions, so that the complicated operation of manually unlocking and unfolding the bottom shield in the traditional mounting process is avoided, and the time is further saved; in the process that the Christmas tree body descends and is installed, the guide groove and the positioning rod are accurately matched, so that installation is quicker and more accurate, the adjusting time is shortened, it is ensured that equipment can be put into use quickly, the bottom protection device and the Christmas tree body are connected in advance, only one-time installation operation is needed, and the installation steps are greatly reduced; automatic unlocking, unfolding and fixing of the bottom shield are achieved, additional manual operation is not needed in the whole process, the installation process is greatly simplified, the number of installation procedures is reduced, the installation time is shortened, and manpower and equipment investment is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of subsea christmas trees, and specifically to a subsea christmas tree with a protection device. Background Art

[0002] With the continuous growth of the global economy, the demand for energy is rising continuously. Land oil resources are gradually facing exploitation pressure, and offshore oil exploitation has received increasing attention. Offshore oil reserves are abundant. As a key device in the offshore oil exploitation system, the subsea christmas tree undertakes important tasks such as controlling the exploitation, transportation, and pressure regulation of well fluids. It is installed at the seabed wellhead and is directly connected to the oil well. The reliability and stability of its performance play a decisive role in the safety and efficiency of the entire offshore oil exploitation operation.

[0003] Existing subsea christmas trees mainly consist of parts such as a body structure, valves, and a control system. The body structure is usually made of high-strength metal materials to withstand the deep-sea high-pressure environment. Valves are used to control the flow of fluids such as oil, gas, and water. There are various types of valves, including gate valves, ball valves, etc., and remote or automatic operation is achieved through the control system. These subsea christmas trees can meet the basic needs of offshore oil exploitation to a certain extent, have relatively mature fluid control technologies, and can ensure the normal exploitation operation of oil wells in a relatively stable marine environment. At the same time, the installation process of the subsea christmas tree generally involves first installing a permanent support base, then installing the bottom protection device, connecting the protection device to the permanent support base, then lowering the christmas tree body, connecting the christmas tree body to the protection device and the permanent support base, then installing the christmas tree cap, and finally installing the top protection device and connecting it to the bottom protection device to protect the christmas tree body.

[0004] However, there are still certain problems in the actual use of current subsea christmas trees on the market. For example, during the installation process, it is necessary to first install the bottom protection device separately and connect it to the permanent support base, and then install the christmas tree body, and then connect the christmas tree body to the already installed protection device and permanent support base. This step-by-step installation method undoubtedly increases the complexity of the installation process. Each installation operation requires corresponding equipment and manpower. Frequent operations not only consume time, but also greatly increase the energy consumption during the installation process, including the energy loss of various installation equipment and the additional resource consumption due to the increased time consumption. This not only increases the construction cost in the early stage of offshore oil exploitation, but also affects the overall efficiency of the exploitation operation to a certain extent. To solve this problem, we have designed a subsea christmas tree with the bottom protection device connected to the christmas tree body, which can omit the redundant step of separately installing the bottom protection device during installation, and is expected to significantly reduce the installation energy consumption and cost and improve the installation efficiency. Summary of the Invention

[0005] The object of the present invention is to provide a subsea Christmas tree with a protection device to solve the problems raised in the above-mentioned background technology.

[0006] To achieve the above object of the invention, the present invention adopts the following technical solutions:

[0007] A subsea Christmas tree with a protection device provided by the present invention includes a Christmas tree body, a guide cylinder and a protection device installed on a permanent base, and is characterized in that: the protection device includes:

[0008] A protection seat, which is detachably connected to the guide cylinder through a connection mechanism and slidably connected to a positioning rod on the permanent base;

[0009] An outer protection frame, which is installed at the corners of the protection seat;

[0010] A bottom protection cover, which is rotatably installed on the outer wall of the end of the outer protection frame. A transmission plate is installed on the top of the bottom protection cover, and a limiting block for the transmission plate is rotatably installed on the top of the outer protection frame, and the end face of the limiting block is in contact with the outer wall of the transmission plate to limit the position of the transmission plate;

[0011] An unlocking device is arranged inside the outer protection frame. The unlocking device includes an unlocking block slidably installed inside the top of the outer protection frame and in contact with the bottom surface of the limiting block, and the unlocking device further includes a push plate slidably installed inside the outer protection frame and corresponding to the transmission plate for pushing the transmission plate;

[0012] A driving mechanism for driving the unlocking device is installed on the outer protection frame.

[0013] As a preferred solution of the present invention, the connection mechanism includes:

[0014] A flange plate, which is fixedly installed on the outer wall of the guide cylinder, and multiple groups of bolts are slidably installed on the flange plate;

[0015] A docking seat, multiple groups of which are symmetrically installed on the protection seat, and multiple groups of nuts corresponding to the bolts are installed on each group of docking seats.

[0016] As a preferred solution of the present invention, multiple groups of positioning grooves corresponding to the nuts are equally angularly opened at the top of the docking seat for limiting the angle of the nuts;

[0017] Threaded holes are opened at the positions of the docking seat where the positioning grooves are opened, below the positioning grooves and communicating with the positioning grooves, and the threaded holes are threadedly connected to the ends of the bolts.

[0018] As a preferred solution of the present invention, a storage groove and a limiting groove corresponding to the transmission plate are opened at the top of the outer protection frame;

[0019] Among them, the bottom surface of the storage groove is in contact with the end face of the transmission plate in the unused state;

[0020] The end face of the limiting groove is in contact with the outer wall of the transmission plate in the use state;

[0021] Two groups of support plates are symmetrically installed on the outer wall of the outer protection frame, and the support plates are in contact with the end face of the bottom protection cover in the unused state. Two groups of blocking strips are symmetrically installed on the outer wall of the outer protection frame, and the blocking strips are in contact with the outer wall of the bottom protection cover in the use state.

[0022] As a preferred solution of the present invention, the unlocking device includes:

[0023] A sliding plate, which is slidably installed in the outer protection frame and fixedly connected to the push plate and the unlocking block, and a positioning block is also installed at the top end of the sliding plate;

[0024] Among them, after the positioning block slides, the end of the positioning block is in contact with the outer wall of the transmission plate in the use state.

[0025] As a preferred solution of the present invention, the end of the push plate is located below the transmission plate in the unused state, and a movable block in contact with the end face of the transmission plate is slidably installed at the end of the push plate, and a buffer spring connected to the movable block is installed inside the end of the push plate.

[0026] As a preferred solution of the present invention, a shaft seat staggered from the transmission plate is fixedly installed in the storage groove, and the shaft seat is rotatably connected to the limiting block;

[0027] Among them, a torsion spring corresponding to the limiting block is arranged on the shaft seat, and the outer wall of the limiting block is in contact with the end face of the shaft seat.

[0028] As a preferred solution of the present invention, the driving mechanism includes:

[0029] A transmission column, which is slidably installed inside the bottom of the outer protection frame and connected to the sliding plate. The diameter of the top of the transmission column is smaller than the diameter of its bottom, and a compression spring in contact with the inner wall of the outer protection frame is installed in the middle of the transmission column;

[0030] A docking plate, which is fixedly installed at the bottom end of the transmission column, and the distance between multiple groups of docking plates is smaller than the width of the permanent base. And during the falling process of the Christmas tree body, the docking plate will be blocked by the permanent base and slide relative to the Christmas tree body.

[0031] As a preferred solution of the present invention, a docking cylinder is installed at the end of the docking plate, and through grooves corresponding to the guiding cylinder and the docking cylinder are opened on the docking seat;

[0032] Among them, the corners at the openings at both ends of the through groove, the corners at the bottom of the guiding cylinder, and the outer corners at the end of the docking cylinder are all designed with chamfers.

[0033] As a preferred embodiment of the present invention, a guiding groove communicating with the docking cylinder is formed at the end of the docking plate, and the bottom of the guiding groove is designed in a flared shape, and the maximum diameter of the guiding groove is larger than the diameter of the positioning rod.

[0034] The subsea Christmas tree of the present invention breaks through the tradition in design. Through the innovative combination and coordinated operation of various components, it demonstrates significant advantages in multiple aspects such as the installation process, protection performance, and cost control, bringing a more efficient and reliable solution to the offshore oil exploitation field. Compared with the prior art, the above one or more technical solutions have the following beneficial effects:

[0035] 1. For the subsea Christmas tree with a protection device, the bottom protection device is pre-connected to the Christmas tree body, and only one installation operation is required, greatly reducing the installation steps; in the connection mechanism, the nut is snapped into the positioning groove to fix the angle, and the bolt cooperates with the nut to connect the Christmas tree body and the protection device, with simple operation and firm connection; when connecting to the permanent base, the guiding groove and the positioning rod guide the positioning, and components such as the docking plate and the transmission column work together to realize the automatic unlocking, unfolding, and fixing of the bottom shield, without any additional manual operation throughout the process, greatly simplifying the installation process. Reducing the installation procedures means shortening the installation time and reducing the investment in manpower and equipment.

[0036] 2. For the subsea Christmas tree with a protection device, the Christmas tree body is pre-connected to the protection device and lowered and installed as a whole, reducing the offshore operation time and improving the installation efficiency; the functions of automatic unlocking, unfolding, and fixing of the bottom shield avoid the complex operations of manually unlocking and unfolding the bottom shield in traditional installations, further saving time; during the installation process of lowering the Christmas tree body, the precise cooperation between the guiding groove and the positioning rod makes the installation faster and more accurate, reducing the adjustment time and ensuring that the equipment can be put into use quickly.

[0037] 3. For the subsea Christmas tree with a protection device, simplifying the installation process directly reduces the energy consumption during the installation process, including the fuel consumption and power consumption of various installation equipment; at the same time, reducing the manpower input and equipment usage time reduces the labor cost and equipment rental cost; due to the improvement of the installation efficiency, the occupation time of the offshore platform is reduced, and the platform operation cost is reduced; moreover, the structural design of the present invention is reasonable, and the connection of each component is firm, reducing the equipment damage and maintenance cost caused by improper operation during the installation process.

[0038] 4. For the subsea christmas tree with a protection device, the bottom shield is rotatably installed on the outer wall of the end of the outer support frame and automatically unfolds after the installation of the christmas tree body, providing comprehensive protection for the bottom of the christmas tree body, effectively blocking the collision and erosion of external objects on the bottom of the christmas tree body, and extending the service life of the equipment; components such as the outer support frame, support plate and stop bar cooperate with each other, enhancing the stability of the overall structure, ensuring that the bottom shield remains stable during use, and improving the protection effect; components such as the limit block and positioning block precisely limit the position of the bottom shield, preventing the bottom shield from shifting or shaking under external forces such as water flow impact, and ensuring the safe operation of the christmas tree body.

[0039] 5. For the subsea christmas tree with a protection device, the christmas tree body and the protection device are detachably connected through a connection mechanism, facilitating disassembly and repair when the equipment fails or needs maintenance; the bolt and nut connection method in the connection mechanism makes the disassembly and installation operations simple and fast; when a certain component is damaged, it can be directly disassembled and replaced without replacing the entire equipment, reducing the maintenance cost; the design of components such as the outer support frame and bottom shield also facilitates inspection and maintenance, improving the maintainability of the equipment.

[0040] 6. For the subsea christmas tree with a protection device, the cooperation between the guide tube and the through groove on the docking seat, and the design of the guide groove and the positioning rod ensure that the christmas tree body can be accurately connected to the permanent base during installation, reducing the installation deviation; the limitation of the nut angle by the positioning groove ensures the accuracy of the connection, making the connection between the christmas tree body and the protection device more stable and reliable; the close cooperation and precise positioning between components improve the installation quality of the entire subsea christmas tree, ensuring the stability and reliability of the equipment during use. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The schematic diagrams in the specification forming a part of the present invention are used to provide a further understanding of the present invention. The illustrative embodiments and descriptions of the present invention are used to explain the present invention and do not constitute an improper limitation of the present invention.

[0042] In addition, the terms "installation", "setting", "provided with", "connection", "connected", "socketed" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or there is an internal connection between two devices, components or parts. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances.

[0043] Figure 1 is a schematic structural diagram during the installation process of the present invention;

[0044] Figure 2 is a schematic cross-sectional structural diagram of the protection seat of the present invention after sectioning.

[0045] Figure 3 is a schematic structural diagram of the protection seat of the present invention after sectional view;

[0046] Figure 4 is a schematic structural diagram of the present invention after installation;

[0047] Figure 5 is a schematic partial structural diagram of the present invention after installation;

[0048] Figure 6 is a schematic sectional structural diagram of the present invention after partial installation;

[0049] Figure 7 is the present invention Figure 6 schematic structural diagram after removing the permanent base;

[0050] Figure 8 is the present invention Figure 5 exploded view of components in;

[0051] Figure 9 is the present invention Figure 1 schematic enlarged structural diagram at position A in;

[0052] In the figure:

[0053] 1. Christmas tree body;

[0054] 2. Guide cylinder; 21. Flange; 22. Bolt; 23. Positioning groove; 24. Nut;

[0055] 3. Permanent base; 31. Positioning rod;

[0056] 4. Protection seat; 40. Outer protection frame; 401. Stop bar; 41. Docking seat; 42. Through groove;

[0057] 5. Bottom guard; 51. Transmission plate; 510. Storage groove; 511. Limit groove; 52. Support plate;

[0058] 6. Limit block; 61. Axle seat;

[0059] 7. Sliding plate; 71. Pushing plate; 72. Movable block; 73. Buffer spring; 74. Unlocking block; 75. Positioning block; 76. Transmission column; 77. Compressed spring;

[0060] 8. Docking plate; 81. Docking cylinder; 82. Guide groove. Detailed implementation manners

[0061] To enable those skilled in the art to better understand the solution of this application, the following will clearly and completely describe the technical solutions in the embodiments of this application in conjunction with the accompanying drawings in the embodiments of this application. Obviously, the described embodiments are only a part of the embodiments of this application, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in this application without creative efforts shall fall within the scope of protection of this application.

[0062] The present invention focuses on solving the problems of complicated installation procedures and high costs of existing subsea christmas trees, and is committed to providing a subsea christmas tree equipped with an innovative protection device. With the coordinated operation of various components, this device simplifies the installation process and improves the installation efficiency.

[0063] Please refer to Figures 1-9 , a subsea christmas tree with a protection device, which mainly consists of a christmas tree body 1, a guide tube 2, a protection device, and a permanent base 3; the christmas tree body 1, as the core equipment, shoulders the heavy responsibilities of oil extraction, transportation, and pressure regulation; the guide tube 2 assists in accurately positioning and stably connecting the christmas tree body 1 to the permanent base 3; the permanent base 3 provides a solid and stable support foundation for the christmas tree body 1; the protection device not only protects the christmas tree body 1 but also plays a key role during the installation process.

[0064] Specifically, the protection device provided in the present invention includes:

[0065] A protection seat 4 detachably connected to the guide tube 2 through a connecting mechanism, which builds an installation platform for other components of the protection device; it is slidably connected to the positioning rod 31 on the permanent base 3 and plays a key role in positioning and guiding during the installation process, ensuring that the christmas tree body 1 can be accurately installed on the permanent base 3; during the lowering process of the christmas tree body 1, the protection seat 4 slides along the positioning rod 31, guiding the christmas tree body 1 to accurately reach the predetermined position, effectively avoiding installation deviations and improving the accuracy and stability of installation;

[0066] It also includes an outer guard frame 40;

[0067] The outer guard frame 40 is installed at the corners of the protection seat 4, undertaking the tasks of installing unlocking devices and driving mechanisms, and at the same time providing protection and support for internal components; the storage groove 510 and the limiting groove 511 opened at the top of the outer guard frame 40 are respectively used to accommodate the transmission plate 51 in the unused state and the used state, playing a role in accurate positioning and effective limiting;

[0068] When the bottom shield 5 is not unfolded, the transmission plate 51 is located within the storage groove 510, and the bottom surface of the storage groove 510 is in contact with the end face of the transmission plate 51 to restrict its position; after the bottom shield 5 is unfolded, the transmission plate 51 moves to the limit groove 511, and the end face of the limit groove 511 is in contact with the outer wall of the transmission plate 51 to prevent it from moving excessively;

[0069] Meanwhile, the support plate 52 and the stop strip 401 symmetrically installed on the outer wall of the outer support frame 40 support and limit the bottom shield 5 when it is not in use and when it is in use respectively; when the bottom shield 5 is not unfolded, the support plate 52 is in contact with the end face of the bottom shield 5 to provide support for the bottom shield 5 and prevent it from shaking; after the bottom shield 5 is unfolded, the stop strip 401 is in contact with the outer wall of the bottom shield 5 to further fix the position of the bottom shield 5 and enhance the protection effect;

[0070] It also includes a bottom shield 5;

[0071] The bottom shield 5 is rotatably installed on the outer wall of the end of the outer support frame 40, and its main function is to protect the bottom of the Christmas tree body 1; the transmission plate 51 installed at the top works in cooperation with the unlocker to achieve the automatic unlocking and unfolding of the bottom shield 5; during the installation process, when the unlocker releases the restriction on the transmission plate 51, the bottom shield 5 rotates and unfolds around the connection point with the outer support frame 40 under the action of the push plate 71; after the bottom shield 5 is unfolded, its outer wall is in close contact with the stop strip 401, further fixing the position of the bottom shield 5, effectively blocking the collision and erosion of external objects on the bottom of the Christmas tree body 1, and enhancing the protection effect;

[0072] It also includes a limit block 6;

[0073] The limit block 6 is rotatably installed on the top of the outer support frame 40, and its end face is in close contact with the outer wall of the transmission plate 51 to limit the position of the transmission plate 51, and thus limit the rotation of the bottom shield 5; under normal circumstances, the limit block 6 remains fixed to prevent the transmission plate 51 from moving randomly and ensure that the bottom shield 5 is in the closed state; when the unlocking block 74 in the unlocker slides upward and pushes the limit block 6, the limit block 6 rotates around the connection point with the axle seat 61 to release the restriction on the transmission plate 51, enabling the bottom shield 5 to unfold smoothly.

[0074] The present invention also provides an unlocker; the unlocker is a key component to achieve the automatic unlocking and unfolding of the bottom shield 5; it includes an unlocking block 74 slidably installed inside the top of the outer support frame 40 and a push plate 71 slidably installed inside the outer support frame 40;

[0075] When the locking cam 75 is in the state of being moved forward, the locking cam 71 is in the state of being moved forward, and the locking cam 71 is in the state of being moved forward, so that the locking cam 71 is in the state of being moved forward, and the locking cam 71 is in the state of being moved forward, and the locking cam 71 is in the state of being moved forward.

[0076] The present invention also provides a driving mechanism; the driving mechanism includes a transmission column 76 and a docking plate 8;

[0077] The transmission column 76 is slidably installed in the bottom of the outer frame 40 and connected to the sliding plate 7. The compressed spring 77 installed in the middle plays a buffering and resetting role.

[0078] During the falling process of the Christmas tree body 1, the docking plate 8 is fixedly mounted on the bottom of the transmission column 76, and is blocked by the permanent base 3, and slides upward relative to the Christmas tree body 1; the sliding of the docking plate 8 drives the transmission column 76 to move upward, thereby driving the unlocker to work;

[0079] Furthermore, the docking tube 81 and the guide groove 82 at the end of the docking plate 8 cooperate with the positioning rod 31 on the permanent base 3 to assist the Christmas tree body 1 to be accurately installed on the permanent base 3; the bottom of the guide groove 82 is designed in a trumpet shape to facilitate the entry of the positioning rod 31, and the maximum diameter of the guide groove 82 is greater than the diameter of the positioning rod 31, which further reduces the difficulty of installation and improves the accuracy of installation.

[0080] The present invention also provides a connecting mechanism; the connecting mechanism comprises:

[0081] The flange 21 fixedly mounted on the outer wall of the guide cylinder 2 is connected to the docking seat 41 on the protection seat 4 by means of bolts 22; the existence of the flange 21 increases the connection area, making the connection between the guide cylinder 2 and the protection seat 4 more stable and reliable; during the installation process, the flange 21 fits tightly with the docking seat 41, and the bolts 22 pass through the holes on the flange 21 and connect with the nuts 24 on the docking seat 41, so that the guide cylinder 2 and the protection seat 4 are firmly connected together;

[0082] Also includes a bolt 22 and a nut 24;

[0083] Among them, the bolt 22 and the nut 24 are the key components for realizing the detachable connection between the Christmas tree body 1 and the protection device; the bolt 22 passes through the hole on the flange 21 and is connected to the nut 24 on the docking seat 41; during installation, the nut 24 is first snapped into the positioning groove 23 at the top of the docking seat 41, and the positioning groove 23 restricts the angle of the nut 24, ensuring that the bolt 22 can smoothly pass through the flange 21 and be accurately connected to the nut 24; the threaded connection method of the bolt 22 and the nut 24 ensures the firmness of the connection and at the same time facilitates disassembly and maintenance when needed;

[0084] It also includes a docking seat 41;

[0085] Multiple groups of docking seats 41 are symmetrically installed on the protection seat 4 for installing the nut 24; the positioning groove 23 at the top is used to limit the angle of the nut 24 to ensure the accuracy of the connection of the bolt 22; the threaded hole on the docking seat 41 is threadedly connected to the end of the bolt 22 to ensure the firmness of the connection; during the installation process, the docking seat 41 provides a stable installation position for the nut 24 and cooperates with the flange 21 to achieve the tight connection between the Christmas tree body 1 and the protection device.

[0086] The present invention also provides a shaft seat 61;

[0087] The shaft seat 61 is fixedly installed in the receiving groove 510 and is rotatably connected to the limiting block 6; at the same time, a torsion spring corresponding to the limiting block 6 is provided on the shaft seat 61, and the function of the torsion spring is to provide a restoring force for the limiting block 6; when the unlocking block 74 pushes the limiting block 6 to rotate to release the restriction on the transmission plate 51, once the unlocking block 74 no longer applies a thrust to the limiting block 6, the torsion spring will drive the limiting block 6 to rotate back to the initial position to re-limit the position of the transmission plate 51, ensuring that the bottom protective cover 5 remains closed when it does not need to be unfolded; in addition, the shaft seat 61 also provides a stable rotational support for the limiting block 6 to ensure that the limiting block 6 can rotate flexibly to achieve effective restriction and unlocking of the transmission plate 51.

[0088] The present invention also provides a through groove 42;

[0089] The through groove 42 is opened on the docking seat 41 and corresponds to the guide cylinder 2 and the docking cylinder 81; during the installation process of the Christmas tree body 1, the bottom of the guide cylinder 2 is inserted into the through groove 42 to play a positioning and guiding role to ensure that the Christmas tree body 1 is accurately installed on the permanent base 3; the docking cylinder 81 also cooperates with the guide cylinder 2 through the through groove 42 to further enhance the accuracy and stability of the installation; the corners at both ends of the through groove 42 are designed with bevels, which facilitates the insertion of the guide cylinder 2 and the docking cylinder 81, reduces the insertion resistance, and improves the installation efficiency; at the same time, the presence of the through groove 42 makes the connection between the guide cylinder 2, the docking cylinder 81 and the docking seat 41 closer, enhancing the stability of the entire structure.

[0090] In summary, through the elaborate design and coordinated layout of each component, the present invention simplifies the installation process of the subsea production tree and enhances the protection function, effectively solving the problems existing in the prior art, and having remarkable innovation and practicality.

[0091] The invention aims to provide a subsea production tree with a simpler installation process. Its working principle revolves around the connection between the production tree body 1 and the protection device, the process of overall installation onto the permanent base 3, and the automatic deployment and fixation of the bottom shroud 5. Each component plays a different role in it, specifically as follows:

[0092] The first stage is the connection stage between the production tree body 1 and the protection device;

[0093] Before installing the production tree body 1, first connect the production tree body 1 to the protection device through a connection mechanism;

[0094] First, snap the nut 24 into the positioning groove 23 on the docking seat 41. At this time, the angle of the nut 24 will be restricted by the positioning groove 23, ensuring the fixity of the nut 24's angle. In this way, when connecting the bolt 22 subsequently, the accuracy and stability of the connection can be guaranteed, avoiding loose connection caused by the angle deviation of the nut 24, thereby improving the reliability of the connection between the production tree body 1 and the protection device;

[0095] Next, insert the bottom of the guide cylinder 2 into the through groove 42 on the docking seat 41, so that the bottom surface of the flange 21 will be in contact with the top surface of the docking seat 41. The flange 21 is fixed on the outer wall of the guide cylinder 2, and its function is to increase the connection area and improve the stability of the connection;

[0096] Subsequently, the bolt 22 can be passed through the flange 21 and connected to the nut 24 until the bolt 22 is threadedly connected to the threaded hole on the docking seat 41, thus completing the connection between the production tree body 1 and the protection device; This connection method is convenient to operate and can effectively connect the production tree body 1 and the protection device tightly together, laying a foundation for the subsequent overall installation;

[0097] The second stage is the connection between the production tree body 1 and the permanent base 3 and the unlocking and deployment stage of the bottom shroud 5;

[0098] After the production tree body 1 is connected to the protection device, they are lowered together to be connected to the permanent base 3; During the descent of the production tree body 1, since they have been pre-connected, the step of separately installing the protection device is omitted, reducing the installation process, lowering the installation cost and time, and improving the installation efficiency;

[0099] During the process of the Christmas tree body 1 descending and approaching the permanent base 3, the guiding groove 82 will come into contact with the positioning rod 31. The design of the guiding groove 82 facilitates the positioning rod 31 to pass through the docking cylinder 81 and connect with the guiding cylinder 2, playing a role in positioning and guiding, reducing the difficulty of installing the Christmas tree body 1 onto the permanent base 3, and ensuring that the Christmas tree body 1 can be accurately installed at the designated position on the permanent base 3;

[0100] As the protective seat 4 gradually approaches the permanent base 3, the docking plate 8 will come into contact with the top surface of the permanent base 3; at this time, the Christmas tree body 1 has not yet descended to the installation position, causing the Christmas tree body 1 to continue to descend. Since the docking plate 8 can no longer move downward, as the Christmas tree body 1 continues to descend, the continuous descent of the Christmas tree body 1 causes the docking plate 8 to slide upward relative to the Christmas tree body 1; because the docking plate 8 is fixed at the bottom end of the transmission column 76, the two move synchronously; the transmission column 76 is connected to the protective seat 4. When the docking plate 8 slides upward, it drives the transmission column 76 upward, and then causes the protective seat 4 to move downward relative to the transmission column 76, preparing for pushing the limiting block 6 later;

[0101] As the protective seat 4 descends, the push plate 71 pushes the limiting block 6 upward, causing the limiting block 6 to rotate; the limiting block 6 originally restricted the position of the transmission plate 51, and the restriction on the transmission plate 51 is released after rotation; this process realizes the automatic unlocking of the bottom protective cover 5, eliminating the operation of unlocking the bottom protective cover 5 separately and simplifying the installation process;

[0102] At the same time as the limiting block 6 is unlocked, the outer protective frame 40 will drive the transmission plate 51 downward through the bottom protective cover 5; the transmission plate 51 squeezes the movable block 72, causing the movable block 72 to slide at the end of the push plate 71, so that the movable block 72 will be squeezed by the transmission plate 51 and start to move downward. The buffer spring 73 connects the movable block 72 and the push plate 71, playing a buffering role to avoid excessive impact force of the transmission plate 51 on the movable block 72;

[0103] As the outer protective frame 40 continues to descend, the end of the push plate 71 pushes the transmission plate 51, causing the transmission plate 51 to drive the bottom protective cover 5 to rotate and unfold, realizing the automatic unfolding of the bottom protective cover 5 and further simplifying the installation process;

[0104] The third stage is the fixing stage of the bottom protective cover 5;

[0105] When the Christmas tree body 1 descends to the state where both ends of the docking plate 8 are in contact with the top surface of the permanent base 3 and the bottom surface of the protective seat 4 respectively, at this time the Christmas tree body 1 has been installed at the corresponding position. At this time, the bottom protective cover 5 is in a fully unfolded state. At this time, the end of the positioning block 75 has moved to a state where it is in contact with the outer wall of the transmission plate 51, causing the transmission plate 51 to be restricted by the positioning block 75, ensuring the fixed angle of the bottom protective cover 5 after unfolding, preventing the bottom protective cover 5 from rotating randomly, and providing stable protection for the Christmas tree body 1;

[0106] After the bottom shield 5 is fully deployed, the retaining bar 401 is installed on the outer wall of the outer guard frame 40, further restricting the angle of the bottom shield 5, enhancing the stability of the fixation of the bottom shield 5, and ensuring that the bottom shield 5 can effectively protect the Christmas tree body 1;

[0107] When installing this Christmas tree, it only needs to directly connect the Christmas tree body 1 to the protection device first, which can save one step of installing the Christmas tree body 1 or the protection device. At the same time, during the installation process, the bottom shield 5 will automatically unlock, deploy, and fix automatically, eliminating the need for separate operations to unlock, deploy, and fix the bottom shield 5.

[0108] The above is only a preferred specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present invention, according to the technical solution and inventive concept of the present invention, makes equivalent substitutions or changes, and should be covered by the protection scope of the present invention.

Claims

1. An underwater Christmas tree with a protective device, comprising a Christmas tree body (1) mounted on a permanent base (3), a guide tube (2) and a protective device, characterized in that: The protection device comprises: A protective seat (4) which is detachably connected to the guide cylinder (2) via a connecting mechanism and is slidably connected to a positioning rod (31) on the permanent base (3); An outer protective frame (40) is installed at the corner of the protective seat (4); A bottom guard (5) is rotatably mounted on the outer wall of the end of the outer guard frame (40); a transmission plate (51) is mounted on the top of the bottom guard (5); a limit block (6) of the transmission plate (51) is rotatably mounted on the top of the outer guard frame (40); and an end surface of the limit block (6) is in contact with the outer wall of the transmission plate (51) to limit the position of the transmission plate (51); An unlocker is provided in the outer guard frame (40), the unlocker comprising an unlocking block (74) slidably mounted in the top of the outer guard frame (40) and abutting against the bottom surface of the limit block (6), and the unlocker further comprises a push plate (71) slidably mounted in the outer guard frame (40) and corresponding to the transmission plate (51), and used to push the transmission plate (51); The outer protective frame (40) is provided with a driving mechanism for driving an unlocker.

2. The underwater Christmas tree with a protection device according to claim 1, characterized in that: The connecting mechanism comprises: A flange (21), wherein the flange (21) is fixedly mounted on the outer wall of the guide cylinder (2), and a plurality of groups of bolts (22) are slidably mounted on the flange (21); A docking seat (41) is provided, wherein a plurality of docking seats (41) are symmetrically mounted on the protection seat (4), and a plurality of sets of nuts (24) corresponding to the bolts (22) are mounted on each of the plurality of docking seats (41).

3. The underwater Christmas tree with a protective device according to claim 2, characterized in that: The top of the docking seat (41) is provided with a plurality of groups of positioning grooves (23) corresponding to the nuts (24) at equal angles, so as to limit the angle of the nuts (24); The position where the positioning groove (23) is provided on the docking seat (41) is provided with a threaded hole located below the positioning groove (23) and in communication with the positioning groove (23), and the threaded hole is threadedly connected to the end of the bolt (22).

4. The underwater Christmas tree with a protection device according to claim 1, characterized in that: The top of the outer protective frame (40) is provided with a receiving groove (510) and a limiting groove (511) corresponding to the transmission plate (51); Wherein, the bottom surface of the storage groove (510) is in contact with the end surface of the transmission plate (51) in an unused state; The end surface of the limiting groove (511) is in contact with the outer wall of the transmission plate (51) in the use state; Two groups of support plates (52) are symmetrically mounted on the outer wall of the outer protective frame (40), and the support plates (52) are in contact with the end surface of the bottom protective cover (5) in an unused state. Two groups of blocking strips (401) are symmetrically mounted on the outer wall of the outer protective frame (40), and the blocking strips (401) are in contact with the outer wall of the bottom protective cover (5) in a used state.

5. The underwater Christmas tree with a protection device according to claim 1, characterized in that: The unlocker comprises: A sliding plate (7) is slidably mounted in the outer protective frame (40) and fixedly connected to the push plate (71) and the unlocking block (74), and a positioning block (75) is also mounted on the top of the sliding plate (7); After the positioning block (75) slides, its end is in contact with the outer wall of the transmission plate (51) in use.

6. The underwater Christmas tree with a protection device according to claim 5, characterized in that: The end of the push plate (71) is located below the transmission plate (51) in an unused state, and a movable block (72) abutting against the end surface of the transmission plate (51) is slidably mounted on the end of the push plate (71), and a buffer spring (73) connected to the movable block (72) is mounted inside the end of the push plate (71).

7. The underwater Christmas tree with a protection device according to claim 4, characterized in that: A shaft seat (61) staggered from the transmission plate (51) is fixedly installed in the receiving groove (510), and the shaft seat (61) is rotatably connected to the limit block (6); Wherein, a torsion spring corresponding to the limit block (6) is arranged on the shaft seat (61), and the outer wall of the limit block (6) is in contact with the end surface of the shaft seat (61).

8. The underwater Christmas tree with a protection device according to claim 4, characterized in that: The driving mechanism comprises: A transmission column (76) is slidably mounted in the bottom of the outer guard frame (40) and connected to the sliding plate (7), the top diameter of the transmission column (76) is smaller than the bottom diameter, and a compression spring (77) is mounted in the middle of the transmission column (76) and is in contact with the inner wall of the outer guard frame (40); The docking plates (8) are fixedly mounted at the bottom end of the transmission column (76), and the spacing between the multiple groups of docking plates (8) is smaller than the width of the permanent base (3). When the Christmas tree body (1) falls, the docking plates (8) are blocked by the permanent base (3) and slide relative to the Christmas tree body (1).

9. An underwater Christmas tree with a protection device according to claim 2 or 8, characterized in that: A docking tube (81) is installed at the end of the docking plate (8), and a through groove (42) corresponding to the guide tube (2) and the docking tube (81) is provided on the docking seat (41); The corners at the openings at both ends of the through slot (42), the corners at the bottom of the guide tube (2) and the outer corners at the end of the docking tube (81) are all designed to be beveled.

10. The underwater Christmas tree with a protection device according to claim 9, characterized in that: The end of the docking plate (8) is provided with a guide groove (82) communicating with the docking tube (81), and the bottom of the guide groove (82) is designed in a trumpet shape, and the maximum diameter of the guide groove (82) is greater than the diameter of the positioning rod (31).

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