Deep sea ball valve based on dynamic oil seal and self-cleaning

Abstract

This invention relates to the technical field of valves, and more particularly to a deep-sea ball valve based on dynamic oil sealing and self-cleaning. The valve includes a valve body, a ball head, and a valve stem assembly that drives the ball head to rotate. The valve body is filled with oil and has three sealing rings. Each of the three sealing rings has a V-shaped or U-shaped groove that allows oil to be injected, which wets the sealing rings, reduces wear, and increases the valve body's lifespan. The oil also forms a sealing layer, increasing the overall sealing performance of the valve body. A dynamic sealing ring and a fixed sealing ring are also provided. The dynamic sealing ring is driven by the valve stem assembly to press against the sealing rings when the ball head rotates and closes the valve body, reducing oil loss during this process. The second oil storage chamber is divided into a clean oil chamber and a dirty oil chamber, ensuring that during the ball head rotation, mud and sand particles adhering to the sealing rings exposed in the crude oil are carried by the oil into the dirty oil chamber. Through oil injection and drainage maintenance after each opening and closing, wear on the sealing rings is reduced, increasing the valve body's service life.

Description

Technical Field

[0001] This invention belongs to the technical field of valves, and particularly relates to a deep-sea ball valve based on dynamic oil sealing and self-cleaning. Background Technology

[0002] Deep-sea ball valves, as core control components in offshore oil and gas development projects, are widely used in underwater manifolds, subsea pipeline terminals, and oil and gas transmission pipeline systems. Their main function is to reliably open and close pipelines, playing a crucial role in ensuring the safe and efficient transportation of subsea oil and gas resources. As offshore oil and gas development gradually advances into deep and ultra-deep water areas, deep-sea ball valves need to operate for extended periods in more complex and demanding environments, and their performance directly affects the safety and reliability of the entire oil and gas development system.

[0003] Existing deep-sea ball valves typically need to operate at depths of hundreds or even thousands of meters underwater, and must withstand the influence of complex environmental factors such as high hydrostatic pressure, corrosive media, silt particles, and ocean waves or earthquakes for extended periods. At the same time, the maintenance and replacement of equipment in the deep-sea environment are extremely difficult. Deep-sea ball valves are usually required to have a normal service life of more than 20 years without maintenance. Therefore, the technical requirements for deep-sea ball valves are not only reflected in high pressure resistance, corrosion resistance, and zero leakage, but also in high reliability, long service life, and stability in fluctuating environments. This places extremely high demands on their sealing structure, support structure, and dynamic opening and closing performance.

[0004] In the technological development of deep-sea ball valves, early conventional products generally adopted metal-to-metal or metal-to-engineering plastic sealing pair structures. These structures have small sealing compensation and poor adaptability to fluctuating environments. Under high pressure, the sealing surface requires a large pre-tightening force to achieve effective sealing, which leads to increased valve opening and closing torque and insufficient operational flexibility. At the same time, the metal support ring is prone to jamming with the valve seat under external impact, further causing internal leakage or opening and closing failure of the valve. In addition, traditional valve seats are mostly designed as separate units, and there is a risk of leakage at the root of the sealing ring. The continuous contact between the sealing surface and the ball head in the normally open state of the valve can also easily cause material fatigue, shorten the life of the seal. After the fluid enters the valve seat, it may also cause the spring to rust and oxidize, resulting in a decrease in sealing thrust and affecting the overall operational reliability.

[0005] To address the aforementioned issues, the applicant previously proposed a patent with publication number CN222392004U entitled "An Improved Seat Sealing System for a Deep-Sea Ball Valve." This patent integrates a sealing surface on the valve seat support ring for mating with the ball core, designed with upper and lower sealing angles. The upper sealing angle provides support and primary sealing during opening and closing, while the lower sealing angle creates an interference fit for secondary sealing when the valve is closed. This effectively improves sealing performance and safety in conventional deep-sea oil and gas transportation scenarios. Furthermore, the patent utilizes PEEK engineering plastic to fabricate the support ring, leveraging its toughness to enhance the matching deformation capability between the valve seat and valve body, avoiding jamming issues between the metal support ring and the valve seat gland. A spring is installed within the valve seat gland to provide continuous sealing thrust, and a skeleton is incorporated within the support ring to enhance structural strength and protect the PEEK material. A sealing ring is also placed on the support ring to prevent fluid intrusion, thus preventing the spring from rusting and oxidizing. This improved solution significantly enhances the sealing reliability and service life of the deep-sea ball valve.

[0006] However, with the expanding demand for deep-sea ball valves in offshore oil and gas development, especially in crude oil pipelines on offshore drilling platforms, deep-sea ball valves need to withstand opening and closing frequencies far higher than those of traditional subsea pipelines. This places higher demands on the valve's dynamic sealing performance and long-term durability. In such high-frequency opening and closing scenarios, the repeated friction between the seal and the ball head accelerates the wear of the sealing material. Even with PEEK engineering plastics, which have good toughness, their wear resistance life is difficult to fully meet the requirements of high-frequency operation. At the same time, crude oil media often contain mud, sand, and impurity particles. These particles are easily carried into the sealing surface area during valve opening and closing and cause abrasive wear. Existing structures lack an effective cleaning and removal mechanism for impurities, which can easily lead to a decline in sealing performance after long-term operation, ultimately shortening the valve's service life and operational reliability.

[0007] Therefore, how to improve the dynamic sealing stability and long service life of deep-sea ball valves in high-frequency opening and closing applications has become a technical problem that needs to be solved by existing technologies. Summary of the Invention

[0008] The purpose of this invention is to at least solve the technical problem that existing deep-sea ball valves have a reduced service life in applications requiring frequent switching, failing to meet design requirements and making them unsuitable for specific scenarios such as crude oil transport pipelines on offshore drilling platforms.

[0009] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0010] The invention relates to a deep-sea ball valve based on dynamic oil sealing and self-cleaning, comprising a valve body, a ball head for controlling the opening and closing of both ends of the valve body, and a valve stem assembly driven by a drive component to rotate the ball head. The valve body includes a valve seat, a valve cover detachably mounted to the valve seat for limiting the ball head from sliding out of the valve seat, and a labyrinth channel acting at the connection between the valve seat and the valve cover, and a first sealing component mounted on the valve cover for sealing the labyrinth channel and the interior of the valve body.

[0011] The two ends of the ball head are sealed by the second sealing component and the third sealing component respectively, while the first sealing component slides in contact with the top of the ball head;

[0012] It also includes a receiving cavity installed on the valve seat and communicating with the inside of the valve seat. The receiving cavity is divided into an upper chamber and a lower chamber that are not interconnected. The drive assembly for actuating the valve stem assembly is placed in the upper chamber. The lower chamber is connected to an oil supply pipe and filled with oil. The oil is actuated by a hydraulic pump assembly.

[0013] A first oil storage chamber and a second oil storage chamber are provided between the ball head and the valve seat. The first oil storage chamber is connected to the lower chamber. A connecting groove for connecting the first oil storage chamber and the second oil storage chamber is provided on the ball head.

[0014] The connecting groove contains a first fixed sealing ring and a dynamic sealing ring that are mutually fitted together. The first fixed sealing ring is fixedly connected in the connecting groove, and the dynamic sealing ring is located in the first oil storage chamber and is slidably installed in the connecting groove. The dynamic sealing ring is driven to slide by a linkage component set in the first oil storage chamber.

[0015] In some embodiments, the first sealing assembly includes an O-ring fitted on the valve cover and engaging with the valve seat, a first sealing ring fitted on the valve cover and engaging with the ball head, the first sealing ring having a V-shaped or U-shaped groove, and a retaining ring fitted on the valve cover between the first sealing ring and the O-ring.

[0016] In some embodiments, a gap is left between the ball head and the valve seat for the first sealing ring to communicate with the first oil storage chamber and the second oil storage chamber, an oil passage groove is provided on the valve cover for communicating with the first sealing ring and the second sealing ring, and an oil guide hole is provided on the ball head to communicate with the second oil storage chamber and the third sealing ring.

[0017] In some embodiments, the second sealing assembly includes a second sealing ring slidably sleeved on the valve cover, and a first spring group is disposed between the second sealing ring and the valve cover. The third sealing assembly includes a third sealing ring slidably sleeved on the valve cover, and a second spring group is disposed between the third sealing ring and the valve cover. The second and third sealing rings are in contact with a ball head, and a V-shaped or U-shaped groove is formed on the side of the second and third sealing rings that contacts the ball head.

[0018] In some embodiments, a baffle plate is connected to the second oil storage chamber to divide the second oil storage chamber into two parts: a clean oil chamber and a dirty oil chamber. An oil drain groove is provided on the valve seat in the dirty oil chamber, and the oil drain groove is connected to the first sealing ring and the third sealing ring respectively.

[0019] In some embodiments, an oil drain pipe communicating with the sludge chamber on the second oil storage chamber is installed on the valve seat, and an electric check valve is installed on the oil drain pipe;

[0020] In some embodiments, a gap is left between the first sealing ring and the bottom of the connecting groove for oil to pass through, and the ball head is also provided with an installation groove coaxially arranged with the connecting groove, and a second sealing ring is fixedly installed in the installation groove;

[0021] In some embodiments, the valve stem assembly includes a drive rod rotatably mounted in a receiving cavity, an inner sleeve rod coaxially sleeved inside the drive rod and capable of sliding in the axial direction, a boss provided on the inner sleeve rod, and an arc-shaped groove on the drive rod that interacts with the boss to drive the inner sleeve rod to rotate together.

[0022] In some embodiments, the inner sleeve rod is provided with a cross-shaped connecting platform, and the ball head is provided with a mating groove that aligns with the cross-shaped connecting platform on the drive rod.

[0023] In some implementations, the linkage assembly includes a movable seat slidably connected to the dynamic seal ring, a third spring group acting between the movable seat and the dynamic seal ring, a linkage rod slidably connected to the dynamic seal ring along the axial direction of the drive rod, a fourth spring group acting between the linkage rod and the movable seat, the linkage rod engaging with the outer ring of the drive rod, and the outer ring of the drive rod having a guide groove for controlling the relative distance between the movable seat and the first fixed seal ring.

[0024] The beneficial effects of this invention are:

[0025] 1. The present invention includes a valve body, a ball head, and a valve stem assembly for driving the ball head to rotate. After the ball head is installed into the valve body, it will leave a first oil storage chamber and a second oil storage chamber inside the valve body. A connecting groove is provided on the ball head to allow the oil injected into the first oil storage chamber to enter the second oil storage chamber through the connecting groove. At the same time, a first sealing ring, a second sealing ring, and a third sealing ring are provided. Each of the three sealing rings has a V-shaped or U-shaped groove that allows oil to be injected. This not only wets the three sealing rings to reduce the wear of the sealing rings and improve the valve body life, but also forms a sealing layer through the oil to increase the overall sealing performance of the valve body.

[0026] 2. The present invention also includes a dynamic sealing ring and a solid sealing ring disposed in the connecting groove. The solid sealing ring blocks the connecting groove to form an oil injection channel. The dynamic sealing ring can be driven by the valve stem assembly to press against the sealing ring when the ball head rotates to close the valve body, reducing the loss of oil from the sealing ring during the rotation of the ball head. At the same time, by setting the second oil storage chamber as a clean oil chamber and a dirty oil chamber, it is ensured that the mud and sand particles adhering to the sealing rings due to the first, second and third sealing rings being exposed in crude oil during the rotation of the ball head will be carried by the oil and discharged into the dirty oil chamber. This satisfies the need for oil injection and drainage maintenance after each opening and closing, reduces the wear of the sealing rings and increases the service life of the valve body.

[0027] 3. The present invention uses a first and second sealing ring arranged coaxially and symmetrically to dynamically seal the ball head, ensuring that the ball head can increase the tightness of contact with the valve body cavity through the first and second sealing rings during rotation, preventing crude oil from entering the valve body, avoiding the increased wear of the ball head during rotation caused by crude oil, and improving the overall sealing performance. Attached Figure Description

[0028] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the invention. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0029] Figure 1 This is the front view of the present invention.

[0030] Figure 2 This is a perspective view of the present invention.

[0031] Figure 3 It is Figure 1 The structural view of the valve body and each sealing ring after being cut open.

[0032] Figure 4 yes Figure 3 Partial view A in the image.

[0033] Figure 5 yes Figure 3 A structural diagram from another perspective.

[0034] Figure 6 This is a schematic diagram of the structure of the ball head and the various sealing rings.

[0035] Figure 7 yes Figure 3 A schematic diagram of the structure after the valve seat and valve cover are separated by a certain distance.

[0036] Figure 8 It is Figure 5A schematic diagram of the structure after the ball head rotates at a certain angle.

[0037] Figure 9 yes Figure 8 A schematic diagram of the structure after concealing the ball head and some components.

[0038] Figure 10 This is a schematic diagram showing the ball head after it has been separated from the first and second solid seal rings and the dynamic seal ring.

[0039] Figure 11 It is Figure 10 A schematic diagram of the result from another perspective after the first and second solid seal rings and the dynamic seal ring are hidden.

[0040] Figure 12 This is a schematic diagram of the structure after the valve stem assembly is separated from the ball head.

[0041] Figure 13 This is a schematic diagram of the valve stem assembly.

[0042] Figure 14 This is a structural diagram showing the connection relationship between the first solid seal ring and the dynamic seal ring.

[0043] Figure 15 This is a structural diagram showing the combination relationship between the valve stem assembly and the linkage assembly.

[0044] Figure 16 This is a schematic diagram of the structure after the linkage rod and the moving seat are separated.

[0045] In the diagram, 100 is the valve body; 101 is the valve seat; and 102 is the valve cover.

[0046] 200. Ball head;

[0047] 300. Valve stem assembly; 301. Drive rod; 302. Inner sleeve rod; 303. Boss; 304. Arc groove; 305. Cross-shaped connecting platform; 306. Mating groove;

[0048] 4. Maze passage;

[0049] 500, First sealing assembly; 501, O-ring; 502, First sealing ring; 503, Retaining ring;

[0050] 600. Second sealing assembly; 601. Second sealing ring; 602. First spring assembly;

[0051] 700. Third sealing assembly; 701. Third sealing ring; 702. Second spring assembly;

[0052] 800. Receiving cavity; 801. Upper chamber; 802. Lower chamber;

[0053] 9. First oil storage chamber;

[0054] 1000, Second oil storage chamber; 1001, Baffle plate; 1002, Clean oil chamber; 1003, Sludge oil chamber;

[0055] 11. Connecting groove; 12. First sealing ring; 13. Dynamic sealing ring; 14. Oil passage groove; 15. Oil guide hole; 16. Oil drain groove; 17. Oil drain pipe; 18. Moving seat; 19. Third spring assembly; 20. Linkage rod; 21. Fourth spring assembly; 22. Guide rail groove; 23. Mounting groove; 24. Second sealing ring. Detailed Implementation

[0056] Exemplary embodiments of the present disclosure will now be described in more detail with reference to the accompanying drawings. While exemplary embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

[0057] It should be understood that the terminology used herein is for the purpose of describing particular exemplary embodiments only and is not intended to be limiting. Unless the context clearly indicates otherwise, the singular forms “a,” “an,” and “described” as used herein may also mean including the plural forms. The terms “comprising,” “including,” “containing,” and “having” are inclusive and therefore indicate the presence of the stated features, steps, operations, elements, and / or components, but do not exclude the presence or addition of one or more other features, steps, operations, elements, components, and / or combinations thereof. The method steps, processes, and operations described herein are not construed as requiring them to be performed in a particular order described or illustrated unless the order of performance is explicitly indicated. It should also be understood that additional or alternative steps may be used.

[0058] Although terms such as first, second, third, etc., may be used in this document to describe multiple elements, components, regions, layers, and / or segments, these elements, components, regions, layers, and / or segments should not be limited by these terms. These terms may be used only to distinguish one element, component, region, layer, or segment from another. Unless the context clearly indicates otherwise, terms such as "first," "second," and other numerical terms used herein do not imply order or sequence. Therefore, the first element, component, region, layer, or segment discussed below may be referred to as the second element, component, region, layer, or segment without departing from the teachings of the exemplary embodiments.

[0059] For ease of description, spatial relative terms may be used in the text to describe the relationship of one element or feature relative to another element or feature, as shown in the figure. These relative terms include, for example, "inside," "outside," "middle," "outer," "below," "below," "above," "over," etc. Such spatial relative terms are intended to include different orientations of the device in use or operation, other than those depicted in the figure. For example, if the device in the figure is flipped, an element described as "below other elements or features" or "below other elements or features" would subsequently be oriented "above other elements or features" or "above other elements or features." Therefore, the example term "below" can include both upper and lower orientations.

[0060] Reference Appendix Figure 1-3 In terms of overall design, this embodiment of the invention provides a deep-sea ball valve based on dynamic oil sealing and self-cleaning, including a valve body 100, a ball head 200 for controlling the opening and closing of both ends of the entire valve body 100, and a valve stem assembly 300 driven by a drive component to rotate the ball head 200. That is, this ball valve uses a drive component to rotate the ball head 200 to complete the opening and closing of the entire valve body 100. The ball head 200 has a through hole with the same inner diameter as the valve body 100. The through hole on the ball head 200 and the valve body 100 are designed to meet the requirements of... After the inner diameter is connected, the entire pipeline system can be opened. After the ball head 200 rotates to a certain angle, the through hole on the ball head 200 is completely separated from the inner diameter of the valve body 100, thereby completing the closure of the entire pipeline system. In this embodiment, the valve body 100 includes a valve seat 101 and a valve cover 102 for limiting the ball head 200 from sliding out of the valve seat 101. That is, the valve body 100 is divided into two parts: the valve seat 101 and the valve cover 102, which facilitates the assembly of the ball head 200 and the valve body 100.

[0061] In some embodiments, refer to the appendix Figure 3 The ball head 200 is not a complete sphere. In addition to the part used to communicate with the valve body 100, the upper and lower parts of the ball head 200 are also missing a part in the axial direction perpendicular to the through hole of the ball head 200, forming a complete plane with symmetrical upper and lower parts. This makes it convenient to place the ball head 200 into the valve seat 101. In addition, the part of the valve cover 102 that contacts and is installed with the valve body 100 is an annular plane, and is locked and installed by multiple bolts that are evenly spaced.

[0062] It also includes a labyrinth channel 4 at the connection between the valve seat 101 and the valve cover 102, and a first sealing assembly 500 installed on the valve cover 102 to seal the labyrinth channel 4 and the interior of the valve body 100, see attached figure. Figure 4The maze channel 4 is composed of annular flanges that can cooperate with each other on the valve seat 101 and the valve cover 102. By setting the maze channel 4, the flow of water between the valve seat 101 and the valve cover 102 can be increased, making it more difficult for seawater to enter between the valve seat 101 and the valve cover 102. On the other hand, by setting the maze channel 4, the end of the connection between the valve seat 101 and the valve cover 102 can be located at the far end of the first sealing assembly 500, that is, increasing the flow of seawater after breaking through the maze channel 4 and entering the interior of the valve body 100. By setting the maze channel 4, not only can the difficulty of seawater entering the valve body 100 be increased, but the position of the contact source between seawater and the first sealing assembly 500 can also be changed, that is, the seawater must completely pass through all the sealing components in the first sealing assembly 500 before it can enter the interior of the valve seat 101, thereby increasing the sealing effect of the first sealing assembly 500.

[0063] In some embodiments, the first sealing assembly 500 includes an O-ring 501 fitted on the valve cover 102 and engaging with the valve seat 101, and a first sealing ring 502 fitted on the valve cover 102 and engaging with the ball head 200. The first sealing ring 502 has a V-shaped or U-shaped groove. A retaining ring 503 fitted on the valve cover 102 is placed between the first sealing ring 502 and the O-ring 501. In this embodiment, the O-ring 501 is positioned at the innermost end of the valve cover 102, directly contacting the end of the labyrinth channel 4. The O-ring 501 is made of fluororubber and has a certain elasticity. After the valve seat 101 and valve cover 102 are assembled, the O-ring 501 will be pressed against the annular flange on the valve seat 101 (see attached diagram). Figure 4 (as shown), thereby further sealing the labyrinth passage 4.

[0064] It should be understood that the first sealing ring 502 will directly contact the ball head 200 after the valve seat 101 and valve cover 102 are assembled. The first sealing ring 502 is made of polytetrafluoroethylene (PTFE) to ensure its overall rigidity. This ensures that after the valve seat 101 and valve cover 102 are assembled, the first sealing ring 502 will have an interference fit with the space formed between the annular flange of the valve seat 101 and the valve cover 102, thereby increasing the sealing effect and durability of the first sealing ring 502. Furthermore, in this embodiment, considering that the valve body 100 operates in a high-pressure deep-sea environment, the seawater outside the valve body 100... Due to the high pressure, in order to prevent the annular flange of the valve seat 101 from being squeezed and deformed, which would lead to the failure of the seal between the O-ring 501 and the first sealing ring 502, a retaining ring 503 is provided between the O-ring 501 and the first sealing ring 502. The retaining ring 503 is made of metal and is used to provide structural support for the annular flange of the valve seat 101. At the same time, after the valve seat 101 and the valve cover 102 are assembled, the first sealing ring 502 will touch the retaining ring 503, causing the retaining ring 503 to squeeze the O-ring 501, ensuring that the space between the annular flange of the valve seat 101 and the valve cover 102 is fully filled and increasing the sealing performance between the valve seat 101 and the valve cover 102.

[0065] Reference Appendix Figure 1-6 The two ends of the ball head 200 are sealed by the second sealing component 600 and the third sealing component 700 respectively. It should be understood that the second sealing component 600 and the third sealing component 700 in this embodiment are similar to the sealing structure principle used in the existing deep-sea ball valve. The second sealing component 600 and the third sealing component 700 can be slidably installed along the through hole axis of the ball head 200. After the ball head 200 is assembled with the valve seat 101 and the valve cover 102, the second sealing component 600 and the third sealing component 700 will form a tight dynamic seal with the ball head 200, thereby ensuring that the substances in the pipeline will not enter the valve body 100.

[0066] In some embodiments, refer to the appendix Figure 7 and attached Figure 9The second sealing assembly 600 includes a second sealing ring 601 slidably sleeved on the valve cover 102. A first spring group 602 is provided between the second sealing ring 601 and the valve cover 102. The first spring group 602 causes the second sealing ring 601 to tend to move towards the ball head 200, ensuring that the second sealing ring 601 is always in contact with the ball head 200. Furthermore, the first spring group 602 can compensate for wear of the second sealing ring 601. The third sealing assembly 700 includes a third sealing ring 701 slidably sleeved on the valve cover 102. A second spring group 702 is provided between the third sealing ring 701 and the valve cover 102. The second spring group 702 has the same function as the first spring group 602, causing the third sealing ring 701 to tend to move towards the ball head 200 under the action of the second spring group 702, ensuring that the third sealing ring 701 is always in contact with the ball head 200.

[0067] In some embodiments, the second sealing ring 601 and the third sealing ring 701 are each divided into two parts, including a metal part that acts with the spring assembly and a sealing part made of polytetrafluoroethylene integrally formed with the metal part, so as to satisfy that the ball head 200 can be dynamically sealed by the second sealing ring 601 and the third sealing ring 701.

[0068] It is important to understand that this ball valve needs to withstand frequent opening and closing. Although existing deep-sea ball valves employ hardening treatments on the valve seat 101, valve cover 102 interior, and ball head 200 surface to increase wear resistance and extend service life, the first sealing ring 502, second sealing ring 601, and third sealing ring 701 are not treated with additional wear resistance enhancements. Therefore, most deep-sea ball valves are not suitable for frequent switching. Furthermore, the crude oil transported in pipelines often contains fine sediment, inevitably leading to contact between the sealing rings and the crude oil during the rotation of the ball head 200 (see attached diagram). Figure 8 As shown in the image, if the crude oil on the sealing ring is not cleaned in time, it will gradually increase the wear of the sealing ring and greatly reduce the service life of the deep-sea ball valve.

[0069] To solve the above problems, in this embodiment, reference is made to the appendix. Figure 3It also includes a receiving cavity 800 installed on the valve seat 101 and communicating with the interior of the valve seat 101. The receiving cavity 800 is divided into an upper chamber 801 and a lower chamber 802 that are not interconnected. The drive assembly for actuating the valve stem assembly 300 is installed in the upper chamber 801. The lower chamber 802 is connected to an oil supply pipe and is filled with oil. The oil is acted upon by a hydraulic pump assembly. It should be understood that, in this embodiment, industrial lubricating oil is injected into the lower chamber 802. The lower chamber is directly connected to the lubricating oil supply pipe set on the drilling platform and the oil is acted upon directly by the hydraulic pump assembly.

[0070] It should be understood that the upper chamber 801 and the lower chamber 802 are separated by a partition. The partition and the receiving cavity 800 are sealed to separate the upper chamber 801 and the lower chamber 802. The separation structure between the upper chamber 801 and the lower chamber 802 will not be specifically disclosed in this embodiment. In addition, the lower chamber 802 is directly injected with oil from the external hydraulic pump assembly through an external oil pipeline that extends into the seawater.

[0071] In this embodiment, refer to the appendix Figure 10 - Appendix Figure 14 A first oil storage chamber 9 and a second oil storage chamber 1000 are provided between the ball head 200 and the valve seat 101. The first oil storage chamber 9 is connected to the lower chamber 802. A connecting groove 11 is provided on the ball head 200 to connect the first oil storage chamber 9 and the second oil storage chamber 1000. A first fixed sealing ring 12 and a dynamic sealing ring 13 are mutually mating and cooperating in the connecting groove 11. The first fixed sealing ring 12 is fixedly connected in the connecting groove 11, and the dynamic sealing ring 13 is slidably connected in the connecting groove 11. The dynamic sealing ring 13 is driven to slide by the linkage component set in the first oil storage chamber 9.

[0072] It should be understood that, as mentioned above, in this embodiment, in the axial direction perpendicular to the through hole on the ball head 200, the upper and lower parts of the ball head 200 will also be missing a portion, forming a complete plane with symmetrical upper and lower parts. Therefore, after the ball head 200 is assembled with the valve seat 101 and the valve cover 102, two spaces will be left between the upper and lower ends of the ball head 200 and the valve seat 101, which are the first oil storage chamber 9 and the second oil storage chamber 1000 in this embodiment. The first oil storage chamber 9 will be connected to the lower chamber 802 of the receiving chamber 800, so that the oil in the lower chamber 802 will also enter the first oil storage chamber 9. At the same time, the ball head 200 The valve body 100 is symmetrically provided with connecting grooves 11 that connect the first oil storage chamber 9 and the second oil storage chamber 1000. This ensures that both the first oil storage chamber 9 and the second oil storage chamber 1000 are filled with oil. The oil then lubricates the first sealing ring 502, the second sealing ring 601, and the third sealing ring 701. Furthermore, the density difference between the oil and seawater and crude oil further prevents seawater and crude oil from entering the valve body 101. This increases the sealing effect while reducing the wear of the first sealing ring 502, the second sealing ring 601, and the third sealing ring 701 caused by the frequent rotation of the ball head 200, thereby improving the service life of the valve body 100.

[0073] In some embodiments, a gap is left between the ball head 200 and the valve seat 101 for the first sealing ring 502 to communicate with the first oil storage chamber 9 and the second oil storage chamber 1000. At the same time, a V-shaped or U-shaped groove is provided at the end of the first sealing ring 502 that contacts the ball head 200. This satisfies the requirement that after oil is injected into the first oil storage chamber 9, the oil will be squeezed into the V-shaped or U-shaped groove of the first sealing ring 502, thereby satisfying the requirement that the first sealing ring 502 is wetted and lubricated by the oil, thereby reducing the frictional wear of the first sealing ring 502 caused by the ball head 200. Similarly, a V-shaped or U-shaped groove is also provided on the end face of the second sealing ring 601 and the third sealing ring 701 that is in contact with the ball head 200, which can also store oil. By storing oil, not only can the second sealing ring 601 and the third sealing ring 701 be wetted and their wear reduced, but the sealing of the second sealing ring 601 and the third sealing ring 701 can also be increased by filling the V-shaped or U-shaped groove with oil.

[0074] It should be understood that, in order to facilitate the entry of oil into the V-shaped or U-shaped groove of the first sealing ring 502, a first fixed sealing ring 12 and a dynamic sealing ring 13 are mutually mating and cooperating in the connecting groove 11. The first fixed sealing ring 12 is fixedly connected in the connecting groove 11, and the dynamic sealing ring 13 is located in the first oil storage cavity 9 and slidably connected in the connecting groove 11. The dynamic sealing ring 13 is driven to slide by the linkage component set in the first oil storage cavity 9, so that when the dynamic sealing ring 13 is not driven to slide to the state of being in contact with the first sealing ring 502, the first sealing ring 502 can be directly connected to the first oil storage cavity 9, thereby allowing the oil to enter the V-shaped or U-shaped groove of the first sealing ring 502.

[0075] Reference Appendix Figure 4 In order to facilitate the entry of oil into the V-shaped or U-shaped groove of the second sealing ring 601, the valve cover 102 is provided with an oil passage groove 14 for connecting the first sealing ring 502 and the second sealing ring 601, so that the oil in the first sealing ring 502 can enter the second sealing ring 601 through the oil passage groove 14.

[0076] Reference Appendix Figure 11 To facilitate the entry of oil into the V-shaped or U-shaped groove of the third sealing ring 701, the ball head 200 is provided with an oil guide hole 15 that connects the second oil storage chamber 1000 and the third sealing ring 701. This allows the oil in the second oil storage chamber 1000 to enter the V-shaped or U-shaped groove of the third sealing ring 701 through the oil guide hole 15. The oil guide hole 15 has an "L" shaped structure, with one end open on the lower plane of the ball head 200 and connected to the second oil storage chamber 1000, and the other end directly aligned and connected to the lowest vertical position of the third sealing ring 701. This ensures that the oil in the second oil storage chamber 1000 can smoothly enter the V-shaped or U-shaped groove of the third sealing ring 701.

[0077] In some embodiments, a gap is left between the first sealing ring 12 and the bottom of the connecting groove 11 for oil to pass through. The poor sealing effect between the dynamic sealing ring 13 and the ball head 200 can ensure that the oil passes through the dynamic sealing ring 13 and enters the gap between the first sealing ring 12 and the connecting groove 11, thereby ensuring that the oil can enter the second oil storage chamber 1000 from the first oil storage chamber 9.

[0078] Reference Appendix Figure 1-16In some embodiments, the dynamic seal ring 13 corresponds to the position of the first sealing ring 502. Through the action of the linkage component, it is ensured that when the ball head 200 is fully open, the dynamic seal ring 13 is in a contracted state, allowing oil to enter the V-shaped or U-shaped groove of the first sealing ring 502. During the rotation of the ball head 200, the dynamic seal ring 13 is driven to an outward position, allowing it to contact the first sealing ring 502. As the ball head 200 rotates, the dynamic seal ring 13 also rotates in the same direction. During this rotation, the first sealing ring 502 and the second sealing ring 601 located on the side of the ball head 200's rotation direction are exposed and contaminated with crude oil due to the orientation of the through-hole. During this process, the dynamic seal ring 13 is contacted with the first sealing ring 502 and... The second sealing ring 601 is compressed to seal the first sealing ring 502 and the second sealing ring 601. This not only prevents excessive oil loss due to the lack of sealing when the ball head 200 rotates, but also prevents crude oil from entering the first oil storage chamber 9. When the ball head 200 rotates to the open position, the dynamic sealing ring 13 will contract, thus allowing oil to enter the V-shaped or U-shaped groove of the first sealing ring 502 from the first oil storage chamber 9 and discharge the crude oil in the V-shaped or U-shaped groove of the first sealing ring 502 into the second oil storage chamber 1000. This ensures the cleanliness of the oil in the first oil storage chamber 9 and uses the second oil storage chamber 1000 as a temporary storage chamber for contaminated oil. The oil in the entire valve body 100 is renewed by periodically replenishing the lower chamber 802 of the receiving chamber 800 and periodically draining the oil from the second oil storage chamber 1000.

[0079] It should be understood that when the ball head 200 rotates, the third sealing ring 701 will also be exposed to the crude oil. However, in this embodiment, the oil inlet and outlet of the third sealing ring 701 are both located in the second oil storage chamber 1000. At the same time, after the ball head 200 rotates at a certain angle, it can automatically block the injection of oil into the third sealing ring 701, so that crude oil will not enter the first oil storage chamber 9 from the third sealing ring 701 and cause the oil inside the entire valve body 100 to be contaminated.

[0080] In some embodiments, refer to the appendix Figure 9 and attached Figure 11 The second oil storage chamber 1000 is connected to a baffle plate 1001, which divides the second oil storage chamber 1000 into two parts: a clean oil chamber 1002 and a dirty oil chamber 1003. Furthermore, the connecting groove 11 and the oil guide hole 15 are connected to the clean oil chamber 1002 in the second oil storage chamber 1000, so that clean oil will be discharged into the clean oil chamber 1002. At the same time, the dirty oil chamber 1003 of the second oil storage chamber 1000 is used to connect with the first sealing ring 502 and the third sealing ring 701, so that oil contaminated by crude oil will be isolated in the dirty oil chamber 1003.

[0081] In some embodiments, refer to the appendix Figure 9 The valve seat 101 has an oil drain groove 16 located in the sludge chamber 1003. The oil drain groove 16 is connected to the first sealing ring 502 and the third sealing ring 701 respectively, so that the contaminated oil containing crude oil in the first sealing ring 502 and the third sealing ring 701 can enter the sludge chamber 1003 of the second oil storage chamber 1000 through the oil drain groove 16. It should be understood that the position of the oil drain groove 16 in the direction perpendicular to the axis of the through hole on the ball head 200 should not exceed the lowermost position of the first sealing ring 502 and the third sealing ring 701 respectively, so as to ensure that the through hole does not connect with the oil drain groove 16 when the ball head 200 rotates, thus preventing the overall seal from failing.

[0082] In some embodiments, refer to the appendix Figure 9 The valve seat 101 is equipped with an oil drain pipe 17 that communicates with the sludge chamber 1003 of the second oil storage chamber 1000. An electric check valve is installed on the oil drain pipe 17. This allows the hydraulic pump assembly to pump oil into the valve body 100 after the electric check valve opens, replacing the contaminated oil in the second oil storage chamber 1000. Specifically, after each opening and closing action of the valve body 100, the electric check valve will open, and the hydraulic pump assembly will pump a specified amount of oil into the valve body 100, thereby periodically replacing the contaminated oil in the sludge chamber 1003 and completing the periodic replacement of the entire valve body 100. Regular maintenance reduces wear on various sealing components within the valve body 100, increasing its service life. It should be understood that when selecting an electric check valve in the existing technology, those skilled in the art should consider the external water pressure during valve body 100 operation. A swing check valve can be selected, which is suitable for scenarios with a pressure of 12.3 bar, meeting the application scenario of valve body 100 in this embodiment. In addition, the area connected by the electric check valve in this embodiment is filled with oil with a density different from seawater and almost immiscible, so there is no need to worry about seawater entering the valve body 100 through the oil drain pipe 17.

[0083] It is important to understand that the reference appendix... Figure 15 The valve stem assembly 300 includes a drive rod 301 rotatably mounted in the receiving cavity 800. An inner sleeve rod 302, which can slide in the axial direction, is coaxially sleeved inside the drive rod 301, so that the inner sleeve rod 302 can be inserted into the drive rod 301. A boss 303 is provided on the inner sleeve rod 302. An arc-shaped groove 304 is provided on the drive rod 301, which acts with the boss 303 to drive the inner sleeve rod 302 to rotate together. After the drive rod 301 rotates a certain angle, the boss 303 on the inner sleeve rod 302 will contact the edge of the arc-shaped groove 304, so that the inner sleeve rod 302 can be driven to rotate together by the drive rod 301.

[0084] In some embodiments, refer to the appendix Figure 12The inner sleeve rod 302 is provided with a cross-shaped connecting platform 305, and the ball head 200 is provided with a mating groove 306 that aligns with the cross-shaped connecting platform 305 on the drive rod 301. This allows the cross-shaped connecting platform 305 and the mating groove 306 to be joined together, so that after the drive rod 301 is assembled into the valve seat 101, the cross-shaped connecting platform 305 can enter the mating groove 306, and the drive rod 301 can drive the ball head 200 to rotate together when it rotates.

[0085] In some embodiments, refer to the appendix Figure 14-16 The linkage assembly includes a movable seat 18 slidably connected to the movable seal ring 13. A third spring group 19 acts between the movable seat 18 and the movable seal ring 13, satisfying the condition that under the action of the third spring group 19, the movable seal ring 13 tends to move away from the axis of the ball head 200. That is, under the action of the third spring group 19, the movable seal ring 13 will be driven to move in the direction of compressing the first sealing ring 502. A linkage rod 20 is slidably connected to the movable seal ring 13 along the axis of the drive rod 301. A fourth spring group 21 acts between the linkage rod 20 and the movable seat 18, satisfying the condition that under the action of the fourth spring group 21, the linkage... The lever 20 will tend to move away from the axis of the ball head 200. That is, under the action of the fourth spring assembly 21, the linkage lever 20 will extend out of the ball head 200 and be placed in the first chamber. It should be understood that the reason for sliding the linkage lever 20 is to ensure that after the linkage lever 20 and the ball head 200 are assembled, when assembling the ball head 200 and the linkage lever 20 together with the valve seat 101, the linkage lever 20 can be pressed down to retract into the ball head 200, thus facilitating the assembly of the ball head 200 into the valve seat 101. This is to facilitate the drive lever 301 to drive... The movable seat 18 slides along the axial direction of the through hole on the ball head 200, thereby changing the distance between the movable seat 18 and the first sealing ring 502. This allows the dynamic sealing ring 13 to contact the first sealing ring 502 under the action of the third spring assembly 19, thus blocking the V-shaped or U-shaped groove of the first sealing ring 502. The linkage rod 20 engages with the outer ring of the drive rod 301, and the outer ring of the drive rod 301 has a guide groove 22 for controlling the relative distance between the movable seat 18 and the first fixed sealing ring 12. It should be understood that both the dynamic sealing ring 13 and the movable seat 18 slide. Installed in the connecting groove 11 of the ball head 200, assuming that when the linkage rod 20 is not in contact with the drive rod 301, the valve seat 101 or the first sealing ring 502 will not contact the dynamic sealing ring 13. When the third spring group 19 is not subjected to external force, the linkage rod 20 will move towards the drive rod 301 under the action of the third spring group 19. Therefore, in this embodiment, it can be ensured that the linkage rod 20 is always in contact with the drive rod 301. A guide groove 22 is provided on the drive rod 301 to ensure that the linkage rod 20 can be placed in the guide groove 22. The guide groove 22 is set as a "dam" (see attached). Figure 13After the drive rod 301 rotates a certain angle, the linkage rod 20 will slide away from the drive rod 301 along the track of the guide groove 22, thereby shortening the distance between the moving seat 18 and the dynamic seal ring 13. This will cause the third spring group 19 to be compressed, making the dynamic seal ring 13 contact the first sealing ring 502. Subsequently, as the drive rod 301 continues to rotate, the boss 303 on the inner sleeve rod 302 will touch the edge of the arc groove 304 and drive the inner sleeve rod 302 to rotate together, thus completing the function of driving the ball head 200 to rotate together. That is, in this embodiment, when the ball head 200 is in the striking position... When the valve body 100 is open, the bottom end of the guide groove 22 on the drive rod 301 will contact the linkage rod 20. When the valve body 100 needs to be closed, the drive rod 301 rotates, causing the edge of the arc groove 304 to contact the boss 303. At the same time, the contact end face between the linkage rod 20 and the guide groove 22 undulates, causing the linkage rod 20 to slide away from the drive rod 301, thereby causing the dynamic seal ring 13 to contact the first seal ring 502. Subsequently, as the drive rod 301 continues to rotate, the ball head 200 will be driven to rotate at least 90° to reach the position of closing the valve body 100. During this process, the dynamic seal ring 13... The sealing ring 13 always contacts the first sealing ring 502 to prevent crude oil from seeping into the first oil storage chamber 9 through the V-shaped or U-shaped groove on the first sealing ring 502. Subsequently, during the process of resetting the ball head 200 to open the valve body 100, the drive rod 301 is rotated in the opposite direction until the edge of the arc groove 304 on the other side contacts the boss 303. During this process, the drive rod 301 will slide along the end face of the guide rail groove 22 first to one side of the drive rod 301, and then be acted to slide away from the drive rod. After the edge of the arc groove 304 on the other side contacts the boss 303, the ball head 20... 0 is driven to slide in the opposite direction. During this process, the dynamic seal ring 13 will still be in contact with the first sealing ring 502 and the valve body 100. After the ball head 200 is returned to the reset state, the drive rod 301 rotates forward again by a certain angle to make the linkage rod 20 contact the bottom end face of the guide rail groove 22. That is, after the ball head 200 is rotated to the open state, the dynamic seal ring 13 also needs to be released from contact with the first sealing ring 502, so that the oil in the first oil storage chamber 9 can re-enter the V-shaped or U-shaped groove of the first sealing ring 502 and the oil contaminated by crude oil can be discharged into the sludge chamber 1003.

[0086] It is important to understand that during the rotation of the ball head 200, the through hole of the ball head 200 is no longer coaxially set with the second sealing ring 601 and the third sealing ring 701. If the metal seal between the ball head 200 and the inner cavity surface of the valve body 100 is used alone, the reliability is not high, and crude oil may seep into the first chamber. To address this problem, the first solution is to replace all the oil in the ball valve after each opening and closing of the ball valve. This method is wasteful of oil. Another solution is to use dynamic sealing of the ball head 200 to prevent crude oil from seeping in.

[0087] In some embodiments, the ball head 200 is also provided with an installation groove 23 coaxially arranged with the connecting groove 11. A second sealing ring 24 is fixedly installed in the installation groove 23. That is, by setting the first sealing ring 12 and the second sealing ring 24, the ball head 200 is dynamically sealed. During the rotation of the ball head 200, the contact sealing effect between the ball head 200 and the inner cavity surface of the valve body 100 is increased. Optionally, the first sealing ring 12 and the second sealing ring 24 adopt a double-layer structure. The part placed inside the ball head 200 is made of metal material for structural connection and support, and the part extending out of the ball head 200 is made of the same material as the O-ring 501, which has good elasticity and can ensure a tight fit with the valve body 100, thereby ensuring the dynamic sealing of the ball head 200 and adding a safety layer to prevent crude oil from seeping into the first oil storage chamber 9.

[0088] This invention injects oil into the valve body 100, causing the oil to fill the first oil storage chamber 9 and the second oil storage chamber 1000 formed by the ball head 200 and the valve body 100. The second oil storage chamber 1000 is divided into a clean oil chamber 1002 and a dirty oil chamber 1003. This satisfies the requirement that oil is injected from the first oil storage chamber 9 into the clean oil chamber 1002 of the second oil storage chamber 1000 through the connecting groove 11 on the ball head 200. Furthermore, it enables the oil to enter the V-shaped or U-shaped grooves of the first sealing ring 502, the second sealing ring 601, and the third sealing ring 701, thereby increasing the pressure on the first sealing ring 502. 2. The wetting of the second sealing ring 601 and the third sealing ring 701 reduces wear and forms a seal through the oil, increasing the sealing effect. Simultaneously, during the rotation of the ball head 200, the dynamic seal ring 13, the first solid seal ring 12, and the second solid seal ring 24 prevent crude oil from entering the first oil storage chamber 9 after the first sealing ring 502 and the second sealing ring 601 come into contact with the crude oil, thus reducing the loss of oil from the first oil storage chamber 9. After the ball head 200 rotates and resets, the drive rod 301 rotates a certain angle, causing the linkage rod 20 to contact the bottom surface of the guide rail groove 22, thereby enabling the dynamic seal to return to its original position. When sealing ring 13 unlocks, it stops the first sealing ring 502 and the second sealing ring 601 from contact. Oil in the first oil storage chamber 9 then re-enters the first sealing ring 502 and the second sealing ring 601, thereby draining the crude oil from the first sealing ring 502 and the second sealing ring 601 into the sludge chamber 1003. Furthermore, the third sealing ring 701, through the oil guide hole 15 on the ball head 200, automatically disengages from its original position when the ball head 200 rotates, thus automatically preventing oil leakage from the third sealing ring 701 during the rotation and closure process of the ball head 200. Simultaneously, after the ball head 200 is reset, the oil in the clean oil chamber 1002 can re-enter the V-shaped or U-shaped groove of the third sealing ring 701, and the crude oil is discharged into the sludge oil chamber 1003 through the oil drain groove 16. In this invention, oil can be periodically discharged into the valve body 100, and the contaminated oil can be discharged through the oil drain pipe 17 set in the sludge oil chamber 1003. By setting the oil injection and drainage maintenance after each opening and closing of the valve body 100, the service life of the valve body 100 is increased. It is suitable for scenarios where frequent opening and closing are required on crude oil transportation pipelines such as offshore drilling platforms.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A deep-sea ball valve based on dynamic oil sealing and self-cleaning, comprising a valve body (100), a ball head (200) for controlling the opening and closing of both ends of the entire valve body (100), and a valve stem assembly (300) driven by a drive component to rotate the ball head (200), wherein the valve body (100) includes a valve seat (101), and a valve cover (102) detachably installed and disassembled from the valve seat (101) for limiting the ball head (200) from sliding out of the valve seat (101), characterized in that: It also includes a labyrinth channel (4) at the connection between the valve seat (101) and the valve cover (102), and a first sealing assembly (500) installed on the valve cover (102) to seal the labyrinth channel (4) and the interior of the valve body (100). The two ends of the ball head (200) are sealed by the second sealing component (600) and the third sealing component (700) respectively, while the first sealing component (500) slides against the ball head (200); It also includes a receiving cavity (800) installed on the valve seat (101) and communicating with the interior of the valve seat (101). The receiving cavity (800) is divided into an upper chamber (801) and a lower chamber (802) that are not interconnected. The drive assembly for actuating the valve stem assembly (300) is placed in the upper chamber (801). The lower chamber (802) is connected to an oil supply pipe and filled with oil. The oil is actuated by a hydraulic pump assembly. The ball head (200) and the valve seat (101) have a first oil storage chamber (9) and a second oil storage chamber (1000). The first oil storage chamber (9) is connected to the lower chamber (802). The ball head (200) has a connecting groove (11) for connecting the first oil storage chamber (9) and the second oil storage chamber (1000). The connecting groove (11) contains a first fixed sealing ring (12) and a dynamic sealing ring (13) that are mutually mating. The first fixed sealing ring (12) is fixedly connected in the connecting groove (11), and the dynamic sealing ring (13) is located in the first oil storage chamber (9) and is slidably installed in the connecting groove (11). The dynamic sealing ring (13) is driven to slide by a linkage component set in the first oil storage chamber (9). The second oil storage chamber (1000) is connected to a baffle plate (1001), which divides the second oil storage chamber (1000) into two parts: a clean oil chamber (1002) and a dirty oil chamber (1003). The valve seat (101) is provided with an oil drain groove (16) located in the dirty oil chamber (1003), and the oil drain groove (16) is connected to the first sealing ring (502) and the third sealing ring (701) respectively. The valve seat (101) is equipped with an oil drain pipe (17) that communicates with the sludge chamber (1003) on the second oil storage chamber (1000), and an electric check valve is installed on the oil drain pipe (17). The valve stem assembly (300) includes a drive rod (301) rotatably mounted in a receiving cavity (800). An inner sleeve rod (302) capable of sliding in the axial direction is coaxially sleeved inside the drive rod (301). A boss (303) is provided on the inner sleeve rod (302). An arc-shaped groove (304) is provided on the drive rod (301) to drive the inner sleeve rod (302) to rotate together with the boss (303). The linkage assembly includes a movable seat (18) slidably connected to the movable sealing ring (13), a third spring group (19) acting between the movable seat (18) and the movable sealing ring (13), a linkage rod (20) slidably connected to the movable sealing ring (13) along the axial direction of the drive rod (301), a fourth spring group (21) acting between the linkage rod (20) and the movable seat (18), the linkage rod (20) and the outer ring of the drive rod (301) making contact with each other, and the outer ring of the drive rod (301) having a guide groove (22) for controlling the relative distance between the movable seat (18) and the first fixed sealing ring (12).

2. The deep-sea ball valve based on dynamic oil sealing and self-cleaning as described in claim 1, characterized in that, The first sealing assembly (500) includes an O-ring (501) fitted on the valve cover (102) and contacting the valve seat (101), and a first sealing ring (502) fitted on the valve cover (102) and contacting the ball head (200). The first sealing ring (502) has a V-shaped or U-shaped groove. A retaining ring (503) fitted on the valve cover (102) is placed between the first sealing ring (502) and the O-ring (501).

3. The deep-sea ball valve based on dynamic oil sealing and self-cleaning according to claim 2, characterized in that, A gap is left between the ball head (200) and the valve seat (101) for the first sealing ring (502) to communicate with the first oil storage chamber (9) and the second oil storage chamber (1000). An oil passage groove (14) is provided on the valve cover (102) for communicating with the first sealing ring (502) and the second sealing ring (601). An oil guide hole (15) is provided on the ball head (200) to communicate with the second oil storage chamber (1000) and the third sealing ring (701).

4. The deep-sea ball valve based on dynamic oil sealing and self-cleaning as described in claim 1, characterized in that, The second sealing assembly (600) includes a second sealing ring (601) slidably sleeved on the valve cover (102), and a first spring group (602) is provided between the second sealing ring (601) and the valve cover (102). The third sealing assembly (700) includes a third sealing ring (701) slidably sleeved on the valve cover (102), and a second spring group (702) is provided between the third sealing ring (701) and the valve cover (102). The second sealing ring (601) and the third sealing ring (701) are in contact with the ball head (200). A V-shaped or U-shaped groove is provided on the side of the second sealing ring (601) and the third sealing ring (701) that is in contact with the ball head (200).

5. A deep-sea ball valve based on dynamic oil sealing and self-cleaning as described in claim 1, characterized in that, A gap is left between the first sealing ring (12) and the bottom of the connecting groove (11) for oil to pass through. The ball head (200) is also provided with an installation groove (23) coaxially arranged with the connecting groove (11). The second sealing ring (24) is fixedly installed in the installation groove (23).

6. A deep-sea ball valve based on dynamic oil sealing and self-cleaning as described in claim 1, characterized in that, The inner sleeve rod (302) is provided with a cross-shaped connecting platform (305), and the ball head (200) is provided with a mating groove (306) that aligns with the cross-shaped connecting platform (305) on the drive rod (301).

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